I know it's hard, but try to keep the bigger picture in mind. Pushing yourself too much too soon is going to delay your recovery even further, so you'll end up getting back to that level of fitness you're hoping for even more slowly.
Hang in there!
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford
"No matter how slow you go, you are still lapping everybody on the couch."