Digestive system. Is in fluid form and?

I have an upset stomach but it isn't normal. I'm feeling this for almost 2 weeks already. I actually feel bloated always and my stomach really hurts badly some times. My stomach is round and big, too. This started when I woke up to prepare for school but as soon as I stood up, I feel like I want to throw up but nothing came out. I feel very dizzy and can't stood up properly because my stomach hurts so much. I thought the reason for this is drinking coffee twice or thrice a day because I was busy studying for the upcoming exams just to prevent me a little from sleep. So I decided to stop drinking but nothing has changed. Pimples broke out on my chest and according to my research, they said that those were probably because of the problem in the digestive system and I assume it was correct. I was thinking that I was just constipated so I decided to eat yogurt. Although I drink many glasses of water, my waste back then is in fluid form and