Stomach ache. Prescription of medicines.

I was feeling little discomfort in stomachwhen I woke up today. I passed motion 4 times in 3 hours in the morning. No motions after that but I experienced severe stomach pain, felt like vomiting but didn't vomit. Felt severe pain  stomach, umcomfortable in chest area, felt cold and had shivering. Too much yawning was there but couldn't sleep because of the pain. Couldn't turn to any side as I felt more pain when turned towards one side. I didn't sleep for last two days because of other reasons. Somehow, I slept after 3 hrs of suffering. Once I got up, pain reduced but still there is l mild pain in right side of the stomach. When it  happened couple of times earlier like this, this mild pain persisted for 2-3 days, more prominent while wearing pants or when I lifted leg up to do yoga. The pain was worse this time, and thoght I might fall down because of giddiness. So, I booked a consultation thinking not to ignore it. Hoping to get correct diagnosis and prescription of medicines.Thanks!