I have the same exact symptoms after getting my covid Moderna booster. Exactly about 1 week after I noticed small amount of hives on my face and some tightness to my throat/wheezing and some residual cough and Shortness of breath. I do have a history of covid back in September and feel that its more related to having covid, but as I also got the vaccine booster not sure if it could be the vaccine vs covid.. Overall Im doing well, but the dermatographia is frustrating. I have tried a course of prednisone, on zyrtec, and also a betablocker due to tachycardia, use albuterol for the sob. My labs have indicated that my CRP is elevated and have been going up since. Maybe could be a case of serum sickness overall.