Feeling weird...

Anyone else feel like they're super weak and shaky all of a sudden? I have a block of hives on my chest appear and for the past hour I've felt like I'm gonna have explosive 💩 or I'm going to 🤢. Idk if I should take meds or call my specialist who's $190 and appointment

For context, I just finished a course of antibiotics (my biggest trigger) and Tamiflu which have been making me feel off but not reacting. I had a nasty sinus infection, bronchitis, and ear infection