Eczema Treatment Care

I have severe atopic dermatitis (eczema). Here’s the thing. When I’m stressed, I itch more. When I get really itchy, I get stressed about it. This has escalated into screaming fits before (I’m not proud). My dermatologist concludes that I have panic attack disorder and she prescribed me Doxepin. The doxepin has only stopped the itching and stress in the sense that I can’t itch in my sleep. Its only effect has been sleep. So, is there a link between skin conditions and panic attacks, or is my dermatologist wrong on this one? Also, how I go about asking for a change from the doxepin. I hate it.