I am 13 months out and feel sick all of the time. I have a lot of nausea. The last month i have really felt bad, no energy, blacking out, nausea, dry heavies, stuffy head, cold sweats. I've tested negative for flu and covid but don't have any answers. I cant take vitamins because they make me nauseous. I never know what will make me sick either. Any suggestions? I'm wondering if a post nasal drip can be the problem.