Is it bad to take nyquil if your not sick?

Well i'm not sick but i have sharp stomache pains that come and go.. and it just feels like pressure on my stomache, not like sorness though it's hard to explain. I went to the doctor earlier and probably going back tomorrow. But i just can't fall asleep at all, i've tried for like a hour or so. I know my parents have nyquil but i never had it befor, just wondering if it's okay, or maybe if i should just get a pill of advil instead to help the pain and then maybe i can fall asleep better. I have final exams in school tomorrow and i'm probably going to be so tired now :/ thanks