You've done a great job so far but is it worth thinking about whether you are tired because you are giving your body too little food. Your weight is very low, I know you are close to your target but unless you are very short or very slight perhaps it is time to reconsider whether those last few pounds are really necessary. I wish you well but I understand how quickly this obsession with losing weight that we all have on FS has the potential to be something bigger and more destructive.