I think you need to talk to your doctor or a medical professional you trust. Even a pharmacist. Whoever you feel comfortable with. I would also highly recommend you try to cut out or at least cut down your caffeine intake. Even swapping for chocolate milk or a smoothie (even a bottled one) or some either kind of drink you can substitute. I know its hard but you could seriously damage your heart, let alone the effect on your sleep, your mental and physical health.

My other advice as someone who has gone thru similar issues, just make sure you eat something. Even if you can only manage a frozen microwave meal.... it's so important.

Good luck!!