One day at a time. One hour or one minute at a time if need be. 3 months out of a 6 relationship is EARLY to go out on a date. If you need help getting through your day, make a TO DO list or a schedule and just go through the motions. The rest of the time, take care of yourself. Yes, this is tough. You're in detox from your drug of choice: him. There are going to be cravings and lows. Expect this. Remember though, no one ever died from being uncomfortable.
As for wanting him back...you don't really want HIM back. You want the fantasy of what you wanted him to be. He's not that person and I wonder if he ever was. Try to remind yourself of that. And KEEP POSTING!