Yikes. It shouldn't take more than a few days for swelling to go down; a rash should disappear in a day. You should be on your feet again in only 2-3 days, sometimes less. I hope that you're carrying an epipen! Administered quickly at the start of anaphylaxis, it can greatly reduce your recovery time in the end. I also pop 100mg of benadryl for good measure, then get to the hospital!