I feel helplessly drained from time to time. I feel helplessly drained from time to time.

This is correct but it sounds a bit like you’re complaining but I’m not sure if that is what you wanted it to seem like.

I have beenfelt depressed before. I have felt depressed before.

‘been’ sound ms a bit direct.

I guess the conditionose feelings still comes back to me sometimes. I guess those feelings still come back sometimes.

Maybe I will feel better if I forcmake myself to exercise regularly. Maybe I will feel better if I make myself exercise regularly.