I just recently finished a Z-pack, no side effects. If you've been sick for that long and tried all the vitamins and healthy stuff with no luck, I would go ahead and take it. I had symptoms similar to yours for about 2 months as well. I took Wellness Defense, Vit C, Astragulas, Zinc, CLO, Probiotics, nothing helped. I was absolutely miserable but I really hate taking Rx so I kept saying to myself it was viral and that I would get better soon. I didn't. 24 hours after Allegra and Z -pack I felt like a normal person again. I would suggest just taking 1/2 Allegra, just one time though to see how it makes you feel. It made me really jittery and unable to sleep.
Also, I would take a probiotic or eat lots of yogurt while on any antibiotics to help guard against getting a yeast infection.