I get really tired when I eat too many carbs. I will literally pass out. If I have a good balance of protein and carbs I'm usually fine.
Double check the amount of carbs you're eating, that could be the culprit. Also have you checked the side effects of all the medications you take? If you take Metformin it can deplete your body of vitamin B12 which can affect your energy levels.
I've been a bit out of control myself the past several weeks - indulging in some ice cream and chips which I rarely do. I know I need to reel myself in before things get totally out of hand. I've been avoiding going to the grocery store to get the healthy foods I normally eat and rely on McDonald's oatmeal for breakfast when I should be having fat free Greek yogurt and fruit.
I think a lot of times we start feeling sorry for ourselves and revert to our old habits. I'm pretty sure that is what has been my problem. So I'm giving myself a mental kick in the butt and a serious talking to. I've come to far to go backwards. I love my smaller clothes and the way I look and feel. I still have a way to go to get to where I want to be. I don't want to be old and sick before my time.