Hi
Welcome to the forum!
A weird feeling in stomach can be due to acidity, food allergies like lactose allergy, gluten allergy (Celiac disease), allergy to citrus fruits etc. For this you would need to keep a stress diary and note daily food intake along with symptoms. The other possibilities are Crohn’s disease, ulcerative colitis, or IBS.
Since you have generalized aches you should consider these possibilities seriously. The other causes like fibromyalgia and chronic fatigue syndrome should also be looked into.
Extreme anxiety like the one you had over HIV can also precipitate these symptoms.
Hope this helps. I think you should discuss these possibilities with your doctor. It is difficult to comment beyond this without examining. Please let me know if there is any thing else and do keep me posted. Take care!