Hello i have been diagnosed with sinusitis three months ago, after 5 days on bilaxin i started having major anxiety issues, heart papilations, chest pain , headaches , etc. my Dr. took me off of them and put me on a 10 course of amoxicllin which i still had same side effects as before, i finnally went back last week after medicines not helping still with sinus pressure, constant draining, etc. I was put on doxycycline and almost immediatley after first dose my symptoms of sinusitis were gone, i have been on this antibiotic for 5 days now with no-little sinus problems, however now im experiencing anxiety again and chest pain and BAD headaches, and all day when i stand up i feel dizzy and spaced out like im going to pass out. any suggestions as to what this might be?