That's one of the biggies. How do you redefine yourself and "strongly" still do what you can? I always felt like I was coming from a position of strength. It simply takes a whole bunch of time to even start to get used to it. Hell, for two years (no kidding), I didn't recognize myself in the mirror. I mean not literally, but your self perception takes a major hit. And since I was always very comfortable in my own skin, it was/is really hard to deal with for me. I don't have it all figured out yet (and probably never will), but it seems like some confidence comes back as you slowly start to redefine yourself. All this psychobabble bullshit like "redefining yourself" and "your sense of self" really pisses me off since I like things I can touch and feel and grab a hold of, but I must admit I had no idea. It's not all bullshit, and you realize this as you're trying to figure out what to do with yourself.
I always absolutely loved my Sunday morning routine. I was out of bed before anyone in the family. I would do the morning ritual and then head out on a long bike ride, a racquetball match, a long run, anything physical. And then I'd be showered and ready to go before anyone else barely got rolling. Now I dread showers due to the dizziness that results, I can barely work out at all, let alone a "long" workout. So I ended up with so much time on my hands since I was always so incredibly busy. Hell, after the workout in the morning, I'd work outside all damn day most of the time.
So filling up all that formerly productive time is very challenging. How can you make a whole day productive when you can't do dick? That's what I continue to struggle with but am getting better. I had very good self esteem because I felt like I was uber productive, and when I wasn't doing that, I was doing something for my health. So now I can read, watch TV, talk with people, play games, yada yada. Nothing hurtful, but nothing like I'm used to and nowhere near as productive. I struggle doing all the laundry sometimes due to having to go downstairs and carry baskets up.
I think anyone who has to change their routine, their likes, basically all the things that becoming a successful adult entail, will do a number on anyone's self esteem and self image. So now I have to pull all my image boosting 'stuff' from places I've never been. I don't know how successful I'll be, and I definitely don't feel like I'll ever get back to being as content as I was, but I just know that recognizing it and, at the minimum, trying to get some self esteem back is in every way preferrable to the alternative. You've asked a very important question that can sort of be summed up by "so now what?". I mean we still have to strive for happiness. I just don't know what it looks like anymore, but, at least for now, I won't stop trying.
I hope that helped. I know I didn't give you any "you need to do this and this" because I don't know what those things are, but Harvey is also right; change your focus to what you CAN do, not what you can't.