Pain in my stomach all night after eating. 12 hours later. Is it too late to vomit what should I do?

Tums/pepto, wait/see. If it is not too painful and getting better, some tums/peptobismol may help more and then just wait and see..Most likely you will fine, especially if you are young and in general good health. If symptom is worsening with pain etc...I would consult doc asap..Good luck.