Fact is, you have a confidence problem. First and foremost, I applaud your ability to share your inner feelings cuz, hell yeah this is dangerous. Folks, friends and family constantly remind me of that - some more preachy than others.
Am I telling you to go out and sell your two-wheeled vehicles? Hell no. If I were in your shoes, I'd stay off the bikes for a little while - maybe a couple of weeks or so - clear your head. I went down last September. To this day, every so often, I think about things I might could have done differently, regardless of how obvious the problem was. These flashbacks you speak of... Frankly, they're not going to go away any time soon. Accept this, appreciate the fact that it happened. You escaped mostly unharmed and can chalk it up to experience. You know what not to do. However, if you're on the bike and this accident fucks with your head so much that it causes you to make knee-jerk reactions, this will really accomplish two things - creating too much of a possibility of repeating your last mistake or, worse yet, causing you and/or folks around you harm from your inability to let go of the past.
If riding truly is your passion and you don't feel complete without it, then I would suggest you take it nice and slow the first month. Don't try to push it at all. Keep that speed down on unknown roads; don't be afraid to do the speed limit or less; just because you have the power doesn't mean you should try to use it every chance you get; BTTB - get Back To The Basics and think about what you learned when you first started seriously riding, i.e. looking through the turn, keeping your OWN pace and no one else's, regardless of being in a group or out by yourself, etc etc. I think one of the best things you could do right now is get enrolled in an advanced rider course such as the Advanced MSF or, as BG suggested, do a track day on your bike.
Last, but certainly not least, I'll leave you with this - it's ok to be scared shitless. This is a good thing. It means you're still able to make rational decisions about riding and about life in general. It's ok to take the car to work if you're "not feelin' it". It's ok to take time to ponder things. What's done is done - can't change the past. Get your head clear and make the conscious decision to NOT....LOOK....BACK - and MOVE FORWARD. If part of moving forward is to sell the bikes because you feel better with that decision, fine. Ultimately, it's your life and you need to be the one comfortable with the end result, whatever that is. Whatever your decision, be confident you made the right choice and make sure it's something you can live with - without the "what-if"s plaguing you weeks/months down the road.
Everything I've said I'm sure you've already thought about. This topic hits home with me because I was there where you are now. Everybody kept saying how stupid I was to go out and get another bike just as soon as my right hand healed. To hell with them, I say. Can't live your life in fear, doubt, remorse. This is my passion and I don't see it letting up any time soon. But that's me. I appreciate all people's own decisions and differences because, after all, if we were all the same, it'd be damn boring.
Above all else, make the decision that's safest and I don't see you getting into a situation you can't get out of. If you choose to continue to ride, keep that gear on no matter how hot it gets, anticipate the idiocy of others, assume that car from the side road is going to pull out in front of you, etc etc.
My two cents...
http://www.youtube.com/watch?v=wmufqEW7Gtw&feature=player_embedded