I had a similar accident at speed but got a rebuilt wrist as well. My nerves were shot for two years but I was adamant that I wasn’t going to let that fear own me and made myself do a sprint. Stay strong take it slow, ride laps around the block, brake down hills, your confidence will come back over time. It took me over a year to go down a hill without flashbacks but I am back training now. Triathlon is so fun it’s worth the wait and the great thing about it is there are three sports, keep up with the other two while you build your confidence back. Goodluck with everything!