Just to check--do you have some symptoms that you are concerned might be from cancer? Some history of cancer? Is this the fatigue and stomach ache you mention? By all means check in with you primary care physician. These symptoms could be caused by many different things--and can be treatable whatever they are. In my experience as a cancer patient--diagnosis tends to be from scans and biopsies. Really it is several doctors who diagnose and then you tend to get referred to an oncology team. But it might be too early to worry about cancer treatment. When my first husband died--I was 41--I went straight to my PCP because I was having a bunch of physical symptoms. She was very helpful. I think your own doctor can be a great resource. When you find out more--can you check in? Will be thinking of you.