Can you diagnose this? my symptoms include: fatigue, slight stomach pains, headache, and swelling on the palate of my mouth

These : These are very non-specific symptoms that may or may not be related. I would need a lot more information before i begin to attempt to make a diagnosis. My best advice to you is to visit your primary care provider for evaluation and appropriate treatment. Best of luck.

Short answer...NO: These symptoms could be an indication of a variety of medical conditions. You need to see your physician first who may perform tests or refer you to a medical specialist. If your symptoms are severe, then go to a hospital emergency room for their evaluation.