After my accident I contacted the CTC accident helpline but as I wasn’t a member at the time they couldn’t assist me.
Try and find out if there are any CCTV cameras where you had the accident and see if the tapes are still available.
If you don’t have cycling insurance check things like your house contents insurance, mine came in useful which i wouldn’t have expected, but check it soon as I missed the chance to claim for damage to my bike as left it too late.
I hope the police are useful for you, I spoke to the officer who attended mine and he said he was ‘only there to see if I was dead or not’ , and hadn’t taken the details of any witnesses who had stopped so I never found out exactly what happened.
And get well soon and don’t stress about the legal side of things, its easy to get caught up in it when you are off work and stuck on the sofa.