I have no experience with ritalin but i struggle with low vit-d and b-12 levels. If i take b-12 supplement in the morning it gives me a temporary boost of energy. I also have fibromyalgia which one of the symptoms is fatigue so no matter what, i need to rest each afternoon. I read somewhere that some folks w crps have fibro too. Id ck w your doctor though because there could be an underlying issue that might be fixable.