Sorry to hear about it! 2 cents you may appreciate...
First point I would make would be that there is something particularly scary about a cross court one hander with top spin into any rec level backhand. I find I am less error-prone (I don't try to clobber it) when I hit a high spinner. Build your play book around this shot and your opponent won't realize you don't go DTL. Work on quick footed inside out forehands to compensate. Focus wrong footing them on the ad court. At my level, a well hidden drop shot following a good spinner is just as good as a ripper down the line.
Second is try to start stretching. We carry a ton of tension in our neck and it kills flexibility. A few cm's may be all you need to feel comfortable.
3.5 player | Steam 99S| Spiky Shark Black | MSV Co-Focus| 30 ( three zero) lbs