I went to the doctor two days ago, prescribed with amoxicillin fo...

I went to the doctor two days ago, prescribed with amoxicillin for sinus infection (250mg 3x/day). I have asthma as well so the infection has hit me pretty hard. After taking my 4th dose last night there were noticible changes in my sinuses for the better, everything was clearing up, still a runny nose but now clear instead of green/yellow. Before taking the meds I had a terrible itchy throat as well from all the drainage and that is gone as well even though I'm still draining. Side effects last night were no fun though. I've had no appetite as it is, so I eat light before taking any meds at the least, had a yogurt and an apple before taking the meds and I don't know if it was the combination of food and antibiotics or just side effects, but I got a terrible feeling in my stomach like a burning sensation and was also nauseous...wasn't able to sleep for another 4 hours because I was going back and forth to the bathroom. Finally did get to sleep and woke up 6 hours later having to use the bathroom immediately upon waking and that was very unpleasant. A very high yellow diarrhea, and smelled horrible. Still not feeling better, have no idea what to eat and approaching my next dose...gah!