Allergies and medication during pregnancy!!??

So I have a strange allergy..

when my skin gets itchy it

feels like it’s burning and when I scratch i break out in hives the doctor has said it is known as skin writing because the hives come up where I have scratched in lines or where clothes rub..

and so I am on a medication called zista which is not recommended during pregnancy and we are planning to start trying for our second baby so I want to be off them... and I have come off them for three days but I am suffering and I don’t know to manage this condition :(

I know that my eczema was so bad during my first pregnancy I’m worried this allergy will get worse

Has anyone else had this condition and or used this medication?