I need opinions ASAP! I feel sick and my body feels really weak but this heat is also been killing…

I need opinions ASAP! I feel sick and my body feels really weak but this heat is also been killing me. I’ve been sweating like crazy and been going pee like crazy. I’ve been trying my best to keep hydrated as much as I can get out of bed. I called and talked to a nurse and she said I should go to the ER. I’m not sure if I should wait till morning and see how I feel or go in now..