Traveling in Saudi Arabia with a POTS flare and can’t keep down water

For context, I’m Muslim and have been fasting (about 12-14 hours a day no food or drink, yes including water). I did this last year and it wasn’t an issue alhamdullilah. I’ve been drinking LMNTs daily but certainly not close to as much water as I should. I sleep during the day and am up at night when I can drink so I’m not in the heat. But I had a flare last night and passed out and went to the ER in which the doctors told me I was completely fine (Saudi hospital). Since about 4 am I’ve been nauseous and haven’t been able to keep down food or water. I don’t know if I should go back to the hospital to try and get an IV or if I should try and thug it with some anti nausea and hope that works. Advice?

TLTR: had POTS flare, likely dehydrated and can’t keep down water or food. What do I do?