The best thing for you to do right now might be to keep a log of activities to help you to figure out if you are really overdoing things, or if there is some cyclical pattern of energy collapse going on. You might also include foods eaten. The thing is, not every symptom that we develop over time is necessarily related to thyroid. It’s helpful if it IS related to thyroid, but if it is not, and we continue to focus on thyroid as the culprit, we may endure problems like these for longer than necessary.