Thanks for the responses.
I have tried working out in different environments and have not noticed any difference. I highly doubt what I'm going through is an issue with environmental toxins.
Would a stress test perhaps help determine what is wrong with me? I've had so many tests done and still have no answers.
Another thing I've noticed is that I get all the terrible exercise symptoms whenever I drink caffeine. Not sure if this would indicate anything.....
If you can check in with me in a month, I am still working out the details of who can provide the testing, but I think I have a simple way to do some exclusion diagnosis for your case. What I would propose is that you do a simple challenge test as follows:
1) Do not exercise until you feet rested.
2) Next morning, after fasting, get a RBC or blood (not plasma) measurement of pyruvate and lactate on rising. We'll use that to calculate an NAD+/NADH ratio. That will show if you are in an aerobically compromised state at the start of the test.
3) Run for however long is required to produce extreme symptoms.
4) IMMEDIATELY at the end of exercise, and at the beginning of your 30 minutes of symptoms, get another lactate and pyruvate draw, being careful to have the lab label each sample with a name like "Before Exercise" "After Exercise" etc.
My prediction in advance is that you will have fairly normal NAD+/NADH ratios before and after exercise. That would strongly suggest you do not have impairment of your electron transport chain (otherwise you would not be able to maintain the NAD+ ratio after exercise).
A stress test would help if it were done at the right lab. Dr Shallenberger in Carson City, Nevada has a test where he can show at what level you enter glycolysis. A CFS sufferer would go into full on glycolysis at a low level of exertion. Unfortunately, the more interesting thing is a CFS sufferer stays in glycolysis AFTER the end of exercise, and what would be really useful is measuring that in the same physiology lab in days after exercise finishes. No one does that.
Do you have any ability to go to a seashore and run barefoot along the tide break and see if there are any changes in behavior of the symptoms? That environment specifically gives you lots of negative ions and also gives you electrical grounding, which does have immediate metabolic effects on your cells. If you get the same symptoms in such an environment, we can probably rule out environment influences. I'm assuming you don't live in an industrial city of India where the seashore might be even more toxic than the city that pollutes it. If you get much less severe symptoms in that environment, then we have important clues that can be used for further testing to isolate cause.