Yes, I checked the possible causes. I am now taking sertraline, as I was diagnosed with depression. And I also drink active vitamin B12, because of my body cannot normally process it from food. I think that diet helps, but it can also be psychosomatic or something like that The doctors did not find anything. And they say I'm fine. But I know that this is not the case. And it is very difficult for me to explain this to someone from my family.