rash 5 months

I have had a rash for 5 months now.Doctor diagnosed me with pityriasis rosea said it would go away on its own.Well it did for 1 month now its back.When it first started i had two herald patches on each hip diagnosed with ringworm but wasnt ringworm.Turned into rash only on trunk of body hips, thighs arms,back, stomach and in the end my neck.The itchyness was so bad i sratched till i bleed and nothing helped.I thought it was gone and all of a sudden its back on hips, arms, stomach,back etc. I was told my diagnosis only usually occurs once so doctor doesnt think it is pityriasis no more and is doing more blood work now.This time no herald patches when it started.Also very dizzy and feeling sick all the time.
I was wondering if this has happened to anyone else or suggestions. Im tired of suffering and im going threw nursing school right now also on vacation till september want to start healthy without this rash please help if you can thanks