“A strange parasite or something else?”

At around the same time most nights I get a crawling sensation like lots of tiny bugs are crawling all over my body. I also sometimes get mild stomach pains after eating or when I haven't eaten in a long time. Initially thought I had pinworms, but after taking several tests without finding anything, my doctor says I'm imagining it. I've been struggling with this for a long time, and I've tried all sorts of medications. Nothing I've tried has helped. I've also tried ignoring it, but that does not work either. The only lead I've got is that I've seen tiny white dots move across my phone screen a few times after waking up. Is there any parasite that looks like this, and if so, does it match my symptoms? Could it be something else entirely?