Last Night Around 10pm I Went To Go Take Some

Last night around 10pm I went to go take some Tylenol, but I wasn't paying attention properly and (out of habit) I took my ADD medication (adderall). I was able to get to sleep with the help of melatonin supplements, but I woke up right when the dosage wore out (four and a half hours later- 2:30am) and was completely wide awake. I took a bit more melatonin but it didn't help and I was unable to fall back asleep.

That being said, around half an hour ago I started getting this nauseous feeling in my stomach, which I've gotten before after all-nighters. My question for you is, why does my stomach hurt when I don't sleep and is there a way I can fix it until I'm able to go back to bed tonight?