Cant swallow pills HELP?

So about a year ago i tried overdosing on pills i had about 15 Advil's, and woke up the next morning vomiting for 3 days. but now whenever i try to have pills if im sick or have a headache i cant do IT i think about all the time i threw up and i start gaging and spit them out! what can i do so i can start swallowing pills again?