Just thinking that you might want to talk with them about the Covid research on over expressive cytokines in the body. The Zyrtec and Pepcid took away my itching. each one addresses a specific cytokine of which we have many. They are necessary for immunity but in us long haulers they didn't know when to stop and are consequently over acting and creating histamine overabundance which makes you itch!!!
Maybe that's all too simplistic for doctors to grasp but if you Google cetirizine (Zyrtec) and famotidine (Pepcid) for Covid you can find much research and you can hand it to your doctor. If they don't pay attention you might want to find another doctor. I would...and have.