I admire your balls, because if you ever want to get anything done you have to have them, and I've got no program for making them grow. As far as I am concerned, a serious injury is a fracture, a ruptured tendon/ligament/muscle belly, something that involves significant loss of blood like a gunshot wound or a bad sword cut, abdominal or orthopedic surgery, or an overuse injury that cannot be warmed up enough to train through. These things you train around, meaning you train everything else that can be trained while leaving the injury alone, so that the system receives stress but the affected tissue does not. This helps things heal. As a general rule, if you train heavy, you will have injuries. Sorry, that's part of the deal. You have to learn which ones to train through, which ones to train around, and how.
Your test is always this: what would happen if this was 10,000 BC? Because as far as the vast majority of your body is concerned, it is. If you broke your femur 12,000 years ago, you either walked on it if you could, or you died. Therefore, if you can use it, you should -- that's what happened then, and it can also happen now. Using myself as an example, I trained 4 days after my appendectomy (when I was younger in 1986), 10 days after my ACL/MCL right knee (1994), 10 days after my C6-7 cervical fusion, 10 days after my hernia repair, 10 days after my septoplasty, and 3 days after a left patellar tendon repair. I didn't do anything stupid (surgery is expensive)(at least not terribly stupid)(maybe just a little stupid), but I trained.
Doctors are much more concerned with not being sued than they are about your speedy functional recovery. So it is your job to test your limits, and to take advice about why you should lay around on your ass for protracted periods of time with a large grain of salt, especially when given by people who themselves don't train..