I went to my country, did some blood tests, and besides a low iron, low
transferrin saturation and low lymphocites, the also found calcium axalate in my kidney. The TSH was 4,1 (0,7-4.5) and the free T4 was 0,8 (0,7-1,9). So nothing to worry about, according to everyone. Like a week after that test I started to feel as weak as I've never felt before. I would sleep hours and hours (one day I slept 18 hours) but I thought it was because of the low iron.