Face Swelling Day 2! What to do?

I have hEDS and, per my rheumatologist MCAS. Can’t get in for 6 months. I have a video appointment with allergist tomorrow. How is this usually treated?

I have hEDS and, per my rheumatologist MCAS. Can’t get in for 6 months. I have a video appointment with allergist tomorrow. How is this usually treated?