From the sound of it you made a right choice to get out if there wasn't a solution to your emotional barrier. A courageous thing to do when you were already engaged! How long were you together?
The first few days/weeks after a breakup are HORRIBLE, for whatever reason the breakup happened. You're not alone. Sleepless nights; fear, feelings of loss, state of confusion, loneliness. At work I literally couldn't concentrate on ANYTHING. I surfed askmehelpdesk.com literally from 9am to 6pm to read on suggestions, advice and answers (damn glad my boss wasn't there that week). Sob it out, cry, talk with close friends and family about it, nag them about it, it's OK. After that though, do try and pick yourself up, distract yourself and go out and do things with friends, treat yourself, and try to put things into perspective. Sports and exercise to me really helps. It will get better. Over time you can distance yourself a bit from the relationship and think things over, perhaps try and look for a solution, or when you think it's for the better, move on. Some people suggest No Contact after a break-up, I didn't do it and it felt unnatural for me (we were still on good terms), but the amount of contact you have will certainly drop.
I JUST got out of a 2.5 year serious relationship with my ex-gf, it's been 3 weeks now, so I can share your feelings. The first week was HORRIBLE, after that it gets better. I'm still confused, particularly feelings of loneliness when I am home alone, but I manage to put things in perspective. Time will heal and sort things out. We still talk, and perhaps try to sort things out, but I think it's heading a dead end.
Read the stickies on how to get over breakups under relationships (
Relationships - Ask Me Help Desk). They were very helpful for me.