Pain in my left side of my abdomen, fatigue, bowel issues

Hello,

For the past month I have been getting dull pain in my left side of my abdomen that lasts for 6+ hours. This pain usually starts after meals. Sometimes the pain radiates up into my left side of my chest, my right lower abdomen, and my left shoulder blade in my back. I am very fatigued, sometimes have constipation and diarrhea. I also get nausea, have vomited before and usually run a fever while I have the pain. I have lost my appetite due to the fear of having stomach problems after I eat. I looked up my symptoms and it could be lots of things. The pain is worse when I sit up and better when I lay on my right side but very uncomfortable since the dull pain lasts so long. I eat very healthy, workout, and live an overall healthy lifestyle. I am also a in-shape 22 year old women although I probably lost a few pounds since this started happening. I am very confused on what is going on. It is becoming more frequent. Please if anyone has any comments as to what may be happening please help. I have never had my appendix removed or any X-rays done