I posted this the other day but it looks like it didn't go through. Are you perimenopausal or menopausal? If so, there is a strange symptom associated with menopause called formication, which is the sensation of ants or other insects crawling on your skin.
Are you still here? Why did you stop taking your thyroid meds? How long have you been without your medication?
No, there would not be invisible bugs on you.