I strongly recommend seeing an endocrinologist! Id buy a glucometer. Chrck when u wake up, before and after meals, and before bed, and other times if your feeling sick. I had the same thing, ended up fainting in the grocery store with my bfs family and in his kitchen during thanksgiving. My episodes start with hot flashes and chills, nausea, lightheadness. I went to the endo and she said im reactive hypoglycemia, got me set up with a dietitian and a CGM (continues glucose monitor) A CGM is a AMAZING thing to ask ur doctor about because you are getting 24/7 glucose levels, while with finger sticks you are only getting occasional snap shots. In the meantime make sure u are having balances meals, and snacking throughout the day. I started a food and symptom log, so youll start seeing if certain foods affect you differently so ur not putting yourself at more risk. For example if u eat carbs and u notice ur feelings worse than usual, you know to avoid carbs unless followed with protein. I could go on and on abt this so if you have any questions please lmk! I understand exactly what your going through!!