Zithromax Z-Pak and medications

I am a 24 year old female. I got diagnosed with walking pneumonia after having a chest X ray at my doctors office. The doctor prescribed z-pak. I went home and took the first 2 pills and about 2-3 hours after taking it I suddenly experienced uncontrolled rapid heart rate. My heart was pounding so hard i almost fainted. I work in the medical field, and knew immediately that I was in trouble. My husband drove me to the ER, where I was admitted with a heart rate of 186 beats per minute, I honestly felt like i was going to faint, or die. Once they ran several tests and ruled out anything major IE blood clot, they determined I was having an extreme allergic reaction to the z-pak. They gave me IV benadryl and steroids, which immediately started to bring my heart rate down. I do not take any medications ever, other than supplements, this is the first time in 9 years that I have had to take an antibiotic, and this was the only prescription I was taking that day.

I get some stomach cramping from the Z-Pak, but the most disturbing side effect would be the chest pain. I have swollen glands right now and I had vertigo and the doctor told me it was probably a bacterial infection because the gland under my chin is the one that is swollen. Every time I take this medication the side effects are different. I also had the agitation the last time I took Z-Pak. Sometimes I have had the lose bowels, especially after taking the two pills together the first day. Well, I guess it is better than having an infection so I will continue to take it. There are other medications that are worse for me. At least I am not getting a rash and I cannot take penicillin.

Let me tell you guys It has been horrible for me.
a) My doctor gave me a Zpak for a strep throat it was gone in a few days.
But a few weeks later I had a stomach pains that would not go away so then the doctor did a test for H Pylori the antibody test came back positive so then I was on PrevPak(which has Azithromycin) after the 2 week period of these drugs I had a infection come up in my growing area, had burning pain for peeing. It sucked because I was on a trip to Universal Studios and was in Miami for New Years Eve. Well after this went away I had another infection come again in the growing and now its finally starting to go away after the doctor gave me some fugal pills and medications for it. What a nigthmare. With all this going I had diary and hemoroids nasty situation and normally have mouth ulcers so can you image the past two months have been hell for me!!!