Hey,, im 17 and have very dark circles under my eyes at the moment, like you i also belive i got them from taking antibioticts. The antibioticts were actually to treat my acne and they were called akamin (also know as minocyclin i think) anyway i never ever had dark circles until i started taking them which was when i was about 15 they'd of gotten darker since stopping which was because i thought they were giving me dark circles .But Mum's talked me into taking them again because of my acne getting worse.

Everything you mention seemed to relate to all my problems such as having paled alot even though i have olive skin. Having ripled nails. And having bad bowels and a few other things too.The only thing that really didnt relate to me was the sinus ive never really had sinus but my mum gets it alot.I really want them too go but im not sure it would help doing something like what your doing since i havnt got sinus...what do u think??