Allergy flare-up, anyone experienced this?

I had something similar on Saxenda after a step up, an old egg sensitivity I hadn't seen in years popped back up for a couple weeks. Antihistamines and avoiding it until things calmed down did the trick for me, though the swelling you described sounds like good reason to keep pushing your doctor for answers.

Maintenance for three months now and holding. Down 55 lbs over the last year on this journey.

Mine flared around the 0.5 step too, an old shellfish thing I'd written off years ago came back for about two weeks then quieted down on its own. The hives and facial swelling you had sounds more intense than what I dealt with, so definitely worth staying on the doctor until you hear back. For me just avoiding the trigger food while things settled was enough.

Same pattern here, my childhood dairy thing resurfaced a few weeks into my second month and faded after I skipped it for a bit. Down 18 lbs so far and the reaction never came back once things settled. Yours sounds stronger than mine got though, so good call waiting on the doctor before the next step.

Interesting that yours showed up right around a dose step, mine did too. An egg sensitivity I hadn't thought about in years flared up about six weeks in, itchy skin and some puffiness, and it faded after I avoided eggs for a couple weeks. Yours sounds stronger than what I got so sticking with the doctor is smart, but for me it was temporary.