I suffer from sever panic attacks but have only started medication recently. I’m on 10mg Escitalopram and 150mg bupropion. It’s been a huge relief. Panic attacks are almost completely gone after 4 weeks. 
However the past two days I’ve developed hives all over my body. My doc said it’s an allergic reaction and to stop both meds immediately. 
After doing some reading it looks like this is a common reaction, not allergy, and some people power through a couple weeks of itching but then it goes away on its own without stopping the medication. It looks like any SSRI will cause this reaction so I don’t see the point of trying other meds. I would greatly appreciate advice from others who have gone through this!