Last year I was able to to tolerate sun for hours. I used to sit in the sun for 5 hours straight or longer every day during the summer. I just felt better in the sun.
This year I suddenly cant tolerate any tiny amount of sun.
Both sunshine and vitamin D give me the same symptoms.
Makes my CFS 1000 times worse to the point that I am bed bound for 2 weeks.
Dizzines, vertigo, POTS, feeling like my heart will stop beating at any moment, severe fatigue, absolutely no strength, weird feeling like there is blood pooling in my brain/head.
It feels like as soon as vit. D is in my system my body/muscles stop recovering after being active.
I changed a lot of supplements this year but I also quit smoking.
But tbh when I came down with CFS I always had some issues with sun, only when I started smoking cigarettes sitting in the sun became beneficial so I'm quite certain that not the supplements but the lack of nicotine is making a difference this year.
edit: I'm not sensitive to bright light, heat or anything else. It really is just sunlight and vit. D, so I'm pretty sure its the UV-rays in the sunlight that are causing trouble by producing Vit. D
! I think I might have a theory to what's going on with you
According to a paper I'm reading, nicotinamide reverses the immune suppression caused by UV light.
Bernard, J. J., Gallo, R. L., & Krutmann, J. (2019). Photoimmunology: how ultraviolet radiation affects the immune system. Nature Reviews Immunology.
"oral supplementation of humans with nicotinamide prevents UVR-induced immunosuppression" It says.
So if you are high in nicotinamide you don't get immunosuppression.
But when you were smoking, the nicotine hits your cells and reduces the bodies ability to absorb nicotinamide
"Nicotine competes with nicotinamide
for the binding sites in the enzymes needed for the absorption of nicotinamide
, thereby lowering the amounts of nicotinamide
available to cells."
were effectively low in nicotinamide! And now you're high in it. Which means you're no longer getting immune suppression.
Just a theory though. Other minds may want to weigh in... Nitric Oxide is also related to sun exposure and it regulates whether blood vessels contract or expand. Expanding blood vessels would cause all the symptoms you describe.
Can I ask whether you were more susceptible to colds when you were able to sit in the sun, or now? That might give a clue to whether you were immuno-suppressed then.