It's so weird, I've had something like this at a co-working space I was at. Upper level smelled "musty" or something to me, and I felt half-sick every time I w

It's so weird, I've had something like this at a co-working space I was at. Upper level smelled "musty" or something to me, and I felt half-sick every time I would spend a full day up there. Went to the lower level and was fine. When they consolidated to the upper level only, I went with, and my symptoms returned. It was so consistent that I had to leave, but I still feel weird about it...how come no one else was experiencing this? They couldn't smell the same smell and seem to be fine working there day in and day out. Am I really that hypersensitive?