Rapid strep test symptoms and conditions

I had been diagnosed with strep throat, i could see a lot of white spots covering my tonsils and it was hard to swallow. Doctor said rapid strep test came back weak positive but that he would still give me antibiotic. I've been on Biaxin for 3 days now. I never have heartburn, but i am experiencing it now. Diarrhea. Dry sore throat making it hard to swallow. A ton of pressure in my ears. Also, i woke up this morning and my heart was racing a mile a minute and it felt like someone was sitting on my chest making it hard to breathe. I thought i was just being stupid to look on the internet to see if an antibiotic could cause these kind of side effects. This is ridiculous!! You feel bad and have an infection, go to the doctor to get an antibiotic and then you end up feeling even crappier!!!