Brief History: I m a 22yr old female. No history of any illness or disease. For the past 6months I ve been drinking pepsi soda on a regular and eating sweets (lack of exercise) i woke up this morning around 10:30am with sharp pains in my stomach. every few seconds the sharp pain would come and go. also vomiting. (i m not pregnant). Now that it is 8:30pm I have not vomitted anymore, the sharp pain has eased up since this morning but I still feel the cramps every 3to5 minutes . now they are softer cramps. My cycle just came on 2/22/11, I am regular. I smoke ciggaretts and drink on occasions. I hope this is enough information.. should I be worried?? is there anything over the counter I can take??