Need helpful info

I am 38 years old and has been experiencing some major health issues. I have been tested for Prostate Cancer, Colon cancer, HIV and  Hepititus B. Everything came back negative, however I am still having severe stomach pains, weakness, fatigue, neck pain, sore right shoulder and pressure behind my eyes with dryness. I get tired doing simple activities that never bothered me before. I have had light headaches although I have been diagnosed as having Sleep Apnea and Prostatitus my body feels like it's shutting down. I did have a Kidney Stone in which I was told it's not there anymore but I did not feel any pain to determine that it left my body.

I have not had diarrhea, no lymph nodes, constipation or anything else.

I will be going to a cardiologist soon to see if my heart is in order as well as check out my brain at a neurologist. My question here is if anyone here has gone throung the same thing?  Does anyone here have any suggestions or medical help I can use?