Sorry to hear about this.
I had a kayaking incident on the river Tees back in November. I won't bore you with the details (or relive it....) but I was comfortable on big white water.
Now I appear to have lost my bottle a fair bit. I'm nervous when I get on the water if it's grade 3 or above, and I seem to be wimping out a fair bit. The love of the sport has been dented a bit too which is a real bummer.
I was paddling in N. Wales last week, it was enjoyable, but not quite what it once was.
At present I am trying to keep my skills up without overdoing it.
Take it in small steps, ride with other people who will encourage you to get out there. Enjoy small challenges.
Thankfully though, like myself.... you lived to tell the tale.