I am on BP Med and thyroid meds. It started when I hit ketosis. If I would walk outsude IR even sitting it was like my heart would completely stop and two second later with a jolt start back. The moment I ate carbs I felt better. I cheated and ate a real fattening Carb filled meal. I am going to try again Tom to start back. Was it hard for you at first? I feel weak I am so hungry. The first time I did this it was not as bad. I am just wondering if you do truly stop feeling nauseated and so sick after awhile.