Mold in my apartment?

I've been living in my apartment for 3 months. When I first moved in it had a.weird musty smell but I thought it was cuz they painted it so I opened all windows. The smell has not left and a month ago I started to get sick. Headaches, fatigue, stomach aches, dizziness. I notice it most when I'm home. When I leave I feel ok sometimes after an hour but when I go back I feel ill. I just started getting diahrrea in the middle of the night for two nights so now I'm trying to put it all together thinking my apt makes me sick. I've been to the doc nd getting tests done to see if I'm ill but its starting to give me anxiety to where I won't go home and when I am home I get anxiety attacks now. My roomates aren't sik tho but they are gone all day at work. I'm the only one who stays home all day and cleans and cooks so it would make more sense for me to get sick I guess right?