Suggest Antibiotic For Sinus Infection When Diagnosed With IgG2 Deficiency And GERD

I have a lot of medical problems. These include IgG2 deficiency, 2nd degree AV block with bradycardia, arrythmias, PUD/GERD, metabolic syndrome, CFS & FM, & history of thyroid cancer. I have allergies to PCN, Sulfa including spirolactin & others, TCN, cephalexin, & had hives post-op to IV gentamycin. & other drug allergies not related to antibiotics. My problem is this: I have a sinus infection. Was on cipro but caused a major GI problem-ulcer, gastritis, bloating, pain, nausea. So had to DC it. The other standard antibiotic I use is a z-pak. But with the recent advent of the AV block, I hesitate to use a z-pak. What other antibiotics can I use? My doctor is currently only working 3 hrs a day 3 days a week while he is post op from surgery. I am a disabled former nurse & have known my doc for years. If I have options to give him, it would help. Can you suggest anything?