I'm sorry, Joy. I'm a former teacher, too, and I had to give it up several years ago, including subbing. I also found that even teaching Sunday school was too big a commitment for me (I have additional health issues).
I cleaned out my "craft closet" last year and got rid of all of the things I was saving to to crafts with kids. It was a little sad for me, but also a little freeing. It was like having that stuff around was a constant reminder of what I could no longer do. Once I gave it away, I actually felt some relief. I closed that chapter and gave myself permission not to be that person anymore. Now, I'm working on figuring out how I can still be involved, with or without kids.
Only you know if it is too soon or not, but please try to be gentle with yourself and grieve if you need to. It is a big change, and adjusting to it may take some time. Just remember, though, teaching was just a part of you, not who you are. That chapter may be closed, but there is a lot more book left to be written.