Mux - I'm sorry to hear of your injury and wish you good luck and a speedy recovery. I tore my ACL, and damaged my MCL and meniscus playing hoops two years ago. While mine was a bit worse than yours apparently, I can give you some insight.
First, know your body and listen to it! There is a very fine line between letting your body heal and aggressive rehabilitation. My Physical Therapy was very aggressive (2-3 times a week) for an hr, plus, they give you exercises to do at home – DO THEM! Don't skip any! I started my PT one week after surgery.
Second, be patient. I wanted to go running in the worst way – let yourself heal. It was too early for me. They worked on my range of motion, flexibility, balance, weights, and strengthening the muscles in my leg and around the entire knee. Not just the parts I hurt.
Lastly I guess, if you have a Trainer who you think is abusing you, doesn’t really care about YOUR pain, and appears to be torturing you…….in my case, that was a good thing.
Great folk who really pushed me and I still correspond with today!
In my case it took me many months completely to heal. Yours may not be so bad. Now, I do everything I did before my injury, but am a little stiffer and sorer than before my injuries. I also developed a little scar tissue which will have to be dealt with later.
Modern medicine is GOOD!
Good luck!