Is Itchy skin on body linked to my mild scalp psoriasis?

I have mild psoriasis in my scalp which doesn’t bother me to much except when the season changers then I itch like crazy.

But I have noticed that I have extremely sensitive, firstly,Unfortunately insects love me like mosquitoes and also if a flea manages to hitch a ride with me either from my sis’s dog or at the office it bites me and my skin has a terrible reaction.

My entire body starts to itch and I just cannot function at all. I even gave away my beautiful cat ( I looooove cats) as I’m so afraid to have a flea in my home. When I get to hot, I start to itch, when I wear certain clothes I start to itch. I got some tea tree oil but it does not help. I cannot afford to go to a dermatologist as they cannot find what’s wrong with me.

Even when I bath and a rub my body and I get out of the bath my skin burns and starts to itch. Is it due to the proriasis ? I don’t have any signs of psoriasis on my body

Please help, 28 year old who cannot live her life normally