Recovering from fractures from a bike crash and planning races

Hi,

I know everyone is different, and everyone nurse their injuries in different ways and plan out a future schedule of racing.

The reason I am writing is because I recently suffered a bike crash in a triathlon race, and ended up with broken bones. And am looking to get some mental blockage cleared, about racing Vineman Half-Ironman in mid-July.

Injury- 6 fractures on my thoracic and lumbar region. These are on the supporting bones, and not on the spine, so I am able to walk and move my legs.
Its been past 4 weeks now.

Cycling - I have successfully been able to hop onto a trainer in the gym and do some spinning. But I do not get down into aero position right now, will take more time.

I tried running - Running makes me feel as if there is something that is bouncing on my back. So I have still kept that on hold, and am continuing to walk.

Swimming - I haven't tried yet. I feel a kind of pull in my back. However, I have tried few resistance workouts in the gym for my back.
I will try dipping into a pool in another 2-3 days.

Overall, I am yet not sure if I will be able to do the Half-Ironman in mid July. And I have end of May to pull out of the race and loose my registration money.

Has anyone had such experiences of accidents causing bone fractures, and then returning to do a race within few months ? I am definitely not expecting a peak performance here, rather just trying to use my race fees.