If i eat a high carb breakfast and dont eat again at lunch i will become shaky in the hands and itchy on my stomach and chest. happens most often after doing physical activity such as cleaning the house etc. blood sugar drops to 85. what is this?

Your symptoms are most likely being caused by a decreasing blood sugar. You are likely metabolizing the carbohydrates you eat at breakfast and then you need more blood sugar for physical activity. You should have something to eat prior to doing any afternoon activity to avoid your blood sugar dropping-even a snack would likely help to avoid this blood sugar drop. Good luck to you!