I had a small bowl of Cheerios and almond milk didn’t finish it either I must of ate it too fast because it caused dumping syndrome and now I have the worst pain I tried to sleep through it but all night I’ve had diareah and I feel so weak now scared to eat anything will this go away does anyone know of anti nausea medication I can purchase over the counter.

I'm sorry this happened to you. You shouldn't be nauseated all the time. This will certainly go away. Tell your local pharmacist you've had gastric sleeve surgery & need something OTC to relieve nausea. Good luck!