Anxiety triggers severe scratching... anyone else out there feel this way?

I have been dealing with skin parasites for almost twenty years and I have tried almost everything except some anti- parasite drugs. Im ordering more now maybe that will help. I have noticed when I am calm and laying down or just relaxing on the couch my itching is less. I know the drugs have helped relieve some of the infestation. But the moment I get to work or someone upsets me and puts me in a bad mood I itch like crazy. Does anyone else feel this way? And if so what can I do to fix the problem. I have to work and when I get stressed I cant stop scratching. Anybody out there feeling this way?