I’m in Arizona and it’s always super hot here, but it’s usually a dry heat. This summer has been super humid, as well as, hot. It makes me super dizzy and I do get nauseous and weak. I take zofran for the nausea which helps, but I just go inside when I get too weak and dizzy. I know I wasn’t any help, but just wanted you to know I deal with something similar. I hope your doctor is able to help you.