About the bugs thing. I don't want to make you sound like a hypochondriac but I have had to look into this for my uncle. You know best what is going on. I just want to share my uncle's experience. It is different in many ways to what you describe, but similar in many others.
He swore he had bugs under his skin. Swore up & down. He kept bug bombing the house (there is no bugs at the house, I sleep there often to watch my grandmother) over & over again. Every doctor he went to said they didn't see any evidence of bites or bugs. Then he just kept digging stuff out of his skin to show us that was mostly slivers, ingrown hairs, dirt, whatever. Everything he pulled out, was absolutely no different than what I could pull out from under my skin at any given time. We both work with our hands (as do you) all kinds of crap gets under the skin on a daily basis. But we could not convince him that there were not bugs in the house. Exterminators came & told him. Pest control people told him, WE were telling him.
Finally, he went to another doctor that his PCP recommended. & he showed my uncle pictures of stuff you will indeed find under the skin, or you can extract. The doctor asked if he had pulled any of these out, & my uncle said, enthusiastically, "Yes, all of those!"
The doctor then went on to show him better pictures of what the things actually were. Small blackheads, ingrown hairs of various lengths (they can grow very long) slivers of various types, some dirt particles are at such an angle that the can get under the skin. I wasn't there, my mom was, so I'm remembering what she told me. Then the Doctor talked about a disorder (is this what you were mentioning?) that affects people & causes them to think they have stuff growing under their skin, usually bugs. If i recall correctly, the way my mother described it was it's a mental disorder that usually affects middle aged men. It will usually stop for long periods, but instances may be recurring. It took some time, but he finally came to the conclusion that this is what he had. &, it has been recurring. Periodically he goes though that phase again thinking (swearing even) that he has bugs under his skin. The feeling that something is biting him, & the body zaps being main symptoms. However the Dr. explained that many people feel that biting feeling. I get it all the time. It doesn't cause them to assume that they have a disease that he would have had to travel to a far away place & even then his chances of getting it are minimal. The way my mom expressed the Dr., he said it is not even proven to exist, only in theory. I've never looked into that claim, just repeating what she said, he said (damn I'm clever). He basically said to my uncle, "You don't find it strange that every place this occurs (pulling bugs out) are the very same places you are most likely to get slivers, something under the skin, ingrown hairs or blackheads/acne? I remember one of what my uncle showed me, was just acne. I have it all the time. Zits you squeeze & it's like a string of zit cheese comes out. He swore that was a bug he just squished.
So in his case, it was pretty clear that he had the mental disorder (at least to everyone else) I just thought I would share what I knew of it & maybe it could help you. The disorder is not super common, but it affects more people that we would think. The body zaps thing is common for many people. I have them constantly. The best way I could describe it (for me) is it feels like there is a cell phone on vibrate under my skin, & someone is calling it. I have FMS though, & it's a common symptom of FMS. Sometimes, if it's in a place where my cell phone could be stored, I actually go looking for it, only to realize my cell phone is in another pocket. They also tend to hit me in waves. Like I'll have 10 or so a day for about a week, then I don't notice it at all for a while. When it comes back, I'll usually have it for a while again. For me, it's not uncomfortable, or painful. It's just a very weird feeling. You would swear someone is calling you, but I know my cell phone is in my pocket, not my forearm.
Please don't take this as me saying you are crazy. I just wanted you to know about another persons experience with it. In the end, I think what convinced him is that other people live in the house, which is where he swears it came from. No one else in the house has it, or thinks what he proclaims as proof is anything out of the ordinary. If he squeezed a bug out of his skin, I would tell him. When he pops a type of zit that I have 24/7, & I can show him what it is, he still refused to believe it in the beginning. That is the actual disease, is thinking you have something under your skin. For you it doesn't seem to be "bugs", but the phenomenon is thinking there is anything abnormal hiding under the skin, it doesn't have to be bugs. You do what you gotta do. But I figured an experience this rare, it was worth it to at least share what it turned out to be for him.