Hi Iron Feather,
Thanks for having taken the time to create such a detailed thread.
Hi, Quantum! You're welcome, I hope it can help shed some light on this syndrome. I trust that combining the knowledge of all our symptoms and medical test results we will be able to pinpoint the cause someday (I don't believe anymore that doctors will be able to help us soon, most of them just don't want to investigate). Thanks a lot for taking the time to read my thread!
Hopefully, I found that taking enough potassium (around 16 mEq) and magnesium after sports spare me that awful discomfort.
Wow, that's interesting! I took magnesium pills last summer when my tachycardia episodes started, because combining that with my muscle shaking, my cardiologist thought that I could have a low magnesium level. I didn't notice any changes, but I didn't get any adverse effects from it either, and maybe it helped prevent tachycardia sometimes. In the end, both my magnesium and potassium levels were normal, which is why I think that my shaking is caused by something in the nervous system.
Your vitamin D is very low. There is evidence now that low levels of vitamin D are linked with higher levels of inflammation. Did your MD try higher doses to raise your level to normal? Do you feel better in summer when you can have skin exposure to the sun?
I've tried a lot of different vitamin D supplements to raise my level to normal, but so far nothing has worked. I never got tested for it in my childhood, so I can't be sure if it's low because of POIS or if it's always been like that. I suspect it's related somehow, since I seem to have some kind of problem absorbing the nutrients in food (no matter how much I eat, I'm always hungry and skinny), so maybe I can't absorb vitamin D properly. Given all the digestive problems, diarrhea and probably inflammation of the intestines that I had because of eating soy without knowing I was intolerant to it, I wouldn't be surprised if my ability to absorb nutrients was compromised somehow. When I had a colonoscopy done because of haemorrhoids, the doctor took a sample of the lining and the lab said they observed "inflammation of unknown origin", but he dismissed it saying it could be because of the bowel prep powder I had to take before the test. I'm not sure if he was right, and I wonder if there is indeed some kind of permament inflammation in there.
I do feel a lot better during the summer, but I'm not sure if it's because of the heat or the extra sunlight. I suspect it's the warmer temperatures that make me feel better, as I don't go out in the sun very often, and I've noticed that when it gets suddenly cold some of my POIS symptoms appear (this didn't happen before, it started at the same time that the exercise intolerance did), especially the feeling of having warm skin but being very cold inside, the chills, and the tightness in the diaphragm. Since the vagus nerve is responsible for regulating body temperature when it's cold, I believe it could be the culprit of my cold intolerance.
Recently I'm trying to consistently take in the sun a bit every day, for a minimum of 15 minutes, to find out if it raises my vitamin D levels (I'm also taking drops of this vitamin, that are supposedly five times the amount the body needs daily, as prescribed by a doctor).
Last week the UV radiation was so high that I got slightly sunburnt (my skin is extremely white), but it didn't give me any adverse effects, in fact I feel quite well these days apart from a permanent weakness, and I think it's because of the sunlight and the warmer temperatures (and of course, the abstinence and lack of physical exercise). My acne is also lighter than ever, almost non-existent.