I've Been Having Noises Inside My Stomach That Occur On

I've been having noises inside my stomach that occur on the left side and sometimes actually move up to my rectum . The noises can be described as popping, bubbling, screeching and even howling. This has been happening for over 3 years. I changed to a pescetarian diet in high school and then moved up to vegan after 2 years. The noises occured as a pescetarian and then subsided as a vegan and now it has been so embarassing where school, work and going out has been so troublesome that has left me to the point of no return. I had blood work done and it shows i had a good b12 level, and the rest was great i had a little bit of a low vitamin d level but i am taking supplements. I dont know what to do. The crazy thing is, the noises occur after dinner around 5 or 6 at night it gets worse. Ive tried changing up meal times, gluten, exercise and nothing. One times i came back from vacation as a pescetarian and had to rush to the hospital because my left side was in severe pain and it felt like my insides were being slashed. The only thing the doctor prescribed was extra strength pain relief. The only thing the docs found were cysts on my ovaries and nothing else. By the way I need to add that there is a bunch of gas but normal stool. I am not deficient in vitamins or minerals but i do need an aswer. Please help?!?