Hello puzzclar,
I think it's great that you are feeling more like yourself.

I can understand why you might be worried about the good times not lasting...I worry about this too! What helps me is to remember to take things one day at a time, knowing that the only thing I can experience is the present moment. I am not in control of tomorrow, so I will not worry about it. Sometimes it is tough, but it has proven useful for me to live in the now, not the "what if".