Hi, queen of sinus infection here 
Clavulin also causes havoc for me, being the worst
Spoiler
number 2 coming out like number 1
, but that was expected (for me) because of the amoxilin in it.
You really shouldn't have stopped, despite all of the symptoms. If you don't take the full course of antibiotics, the bacteria gets stronger and comes back with vengeance. That is, unless your doctor took you out of the medication,
I'd say the non digestive symptoms are probably related to the infection itself. My doctor always gives me a whole bunch of anti infalmmatories. It takes time for your body to bounce back completely.
Best of luck.