Amoxicillin and stomach

I was prescribed a 10-day regimen of 500 mg capsules, 3 times/day for a tooth infection. First dose at 9:00 pm last night (Friday). Woke up seven hours later with intense itching back of the neck and inner part of both elbows. No other symptoms. Spreading across shoulders and stomach. I'm taking generic antihistamine and applying calamine lotion. No really relieving the symptoms but I'm hoping they will subside my 9:00 am this morning. I'm glad I don't have to try to work in this condition. No plans to take a second dose.

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!

i was prescribed amoxicillin for respiratory infection, after just taking 2 tablets my chest was tight i had terrible flatulence, my head felt really fuzzy, now 4 days on i still have really bad stomach, fuzzy head and strange cough. Will not be taking these pills again

severe nausea and a pain in my stomach that felt like a cross between hunger and being hit in the gut with a soccer ball. vomited once, had some diarrhea, but as soon as i ate something all symptoms were gone.
if i eat small portions frequently, all i have is some mild gas.

I started question the effect 2-500mg twice daily was having on me after a stomach ache the last two days. Not putting two and two together until now, but isn't that over prescribing? I'm taking 2000mg a day all together! Well, today my lower abdomen starting with a shooting pain, I felt like I had gas and had to go to restroom. The pain got worse as I sat on toilet, not able to do anything. I soaked in hot tub as long as I could and went to lay on bed, trying not to move, after while I fell asleep. After I woke the pain in still there a little bit , but bearable. I noticed my left ovary in swollen and tender.