Sentence 1: Tom went eat with a few buddies. 
 Sentence 3: Tom and his friends overindulged in acid rich food 
 Sentence 4:  Slowly, Tom started to feel bad 
 Sentence 5:  He realized it was his indigestion 
 Option 1: He took his medicine before he left. 
 Option 2: He forgot to take his indigestion medicine.