I'm 16 and for the past two days I have had a really sore stomach, when I breathe in deeply its like someone is punching me in the stomach and its really difficult for me to sit up when I'm lying down. I'm worried as I have consumed alcohol and drugs 3 days previous. I'm really not sure what it could be? Also when I cough its really uncomfortable and feels like I'm being punched in the stomach. HELP!

You need to see a doctor right away. This is nothing to mess around with. It could be several things and at least 2 of them are life threatening.