when you gain a lot of weight fast you are gonna have these types of problems.
are you running an AI?
at just 170 pounds and not being natural I really hope you are a midget, otherwise you are severely below your genetic potential.. hence the steroids are packing on fast weight on your skinny frame, hence the lethargy. this is common sense. next time build a proper base bfore running hormones and you won't have these issues.. this isn't the answer you want to hear but its the allah's honest truth... typically people who lose weight fast feel fantastic, but people who gain it fast feel like shit.. your organs are strained bigtime.. whether the weight gain is muscle, fat, water, etc means nothing