Do you also feel "drained"; have poor memory; feel "spacey" or "unreal"; numbness, burning or tingling; insomnia; muscle aches; muscle weakness; attacks or anxiety or crying; cold hands or feet and/or chilliness?
Check into Candida Related Complex caused by Candid albicans infection.
BINGO....low-blood sugar!
i had chronic diarrhea due to IBS for 5 weeks which caused me to feel weak, tired and shaky ..i started taking citrucel (a fiber) daily at the advice of my GI and the diarrhea was gone in 3 days!!
sounds like it could be diverticuitis or irritable bowel syndrome usually a blood test can tell if you are anemic which would also cause tireness
Have you had your blood sugar levels looked at? I don't know about the mild stomach discomfort, but the other symptoms sometimes indicate an imbalance in sugar levels.
I saw a report on TV this morning that said that lots of people are finding out that they are allergic to Soy products. But the number one symptom was nausea.
A weak, lightheaded feeling could be from anemia. You could have a deficiency of folic acid.
The diarrhea could be dehydrating you, causing the rest of the symptoms. Increase you water intake, add some juice and a couple of small glass of gatorade can do wonders.
I am afraid I don't know what the problem is, but I have had all the symptoms... so if you find out let me know! All the best.