Good luck to you, I hope it's working out

In the past I've found that I have felt better for a while after making myself do something, but that it doesn't get any easier to make myself do something the next time. It's almost as though the brain gets used to this state, and that it feels abnormal to be in another mode - even if it's one that feels more positive.

Maybe it takes doing it for a long time before the brain acclimatizes to that 'improved' state and comes to accept it as the norm'?