Why is Exercise Making Me Sick?

Since my full story is very long, I am going to break it down to save you some time. You may ask questions if you need more details to make educated guesses or suggestions.

Brief story:

I'm a man in my early 30's and I have been sick on and off for about 12 years, extremely so the last 8 months. I am pretty fit as I have been exercising regularly and eating extremely healthy for as long as I can remember. 

I have done probably all tests doctors would ever recommend without finding anything special.

After being very ill for the last few months, I haven't been doing any exercise. The last month I was actually starting to feel real good again. I started working out in the gym and after just 2 weeks, I crashed. After everything I've tried changing in my life, I would never have guessed that exercise was the culprit that made me sick.

Here's the list of my todays main symptoms:

- Extreme mental and physical fatigue/lethargy for days/weeks/months.

- Having the need to take naps during the day despite of having long good sleep.

- Massive brainfog and cognitive impairment

- Very sore muscles (especially legs) 2-3 days after working out.

- Shortness of breath

- Constant Bradycardia (47-55 beats/minute).

- Occasional arrythmia (quick beats followed by pause).

- Stiff muscles and joints in the morning.

- Constant stiff and painful neck.

- Low libido for weeks.

- Occasional blurry vision, especially in the evening (washing eyes won't help).

Here most of the tests I have done that all showed normal with few minor exceptions:

- MSLT

- CBC

- Electrolytes

- Testosterone (total/free)

- Albumin

- Estrogen

- Ferritin/iron

- Cortisol (blood): showed elevated

- Cortisol (24h urine): showed normal

- ECG (showed bradycardia)

- Thyroid (TSH, T3, T4)

- Blood Culture

- ANA Immunoflourescent

- All diabetes tests

- C-reactive protein

- Spirometry and anti-astma medicine

- Lung and heart x-ray

- Yeah, even brain CT...

My latest doctor recommended me to try the Stress Test and I am waiting to be scheduled for this.

Questions:

1) What diseases can make you sick long term when you exercse, even as little as 3h/week?

2) Are there any other tests left that you would suggest me ticking off?

3) Other thoughts/suggestions?

I am of course willing to give up exercise to live a normal life, but it would truly blow to not be able to keep the weight, and I also tend to get very stiff without exercise.

I am extremely thankful for any help I can get. I know time is valuable and I therefore consider those helping out on forums true heroes. I am even willing to donate money somewhere if I could be pointed in the right direction and figure it out. I plan to do a lot of charity in the future and help others who are trying to find their "health culprit".

Thank you for listening.

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