If you have a doctor, get an MRI to see the severity. I will tell you from personal experience that a lot of doctors do not know how to treat active people. The first time I tore my lat muscle, I was told to not move for a month. Worst fucking decision of my life. I have a ton of scar tissue in the area and it’s never been the same 3 years later.
Is there any bruising? You’re probably gonna have to lay off any pulling movements for a few days. Once the pain starts to dull, I’d get into the gym and do some very light curls to get blood flow into the area. When I say light curls, I’m talking like a 2.5lb dumbbell for high reps. The worse thing you can do right now is to completely immobilize yourself and let scar tissue form.
Injury recovery is your personal responsibility. The doctor can gauge how bad it is, then you have to decide what you’re going to do yourself.
Credentials: I’ve torn my achilles, my left lat muscle, and my pec three times. I’m currently working through my third pec tear. Still doing pressing movements for 15x-25x reps. Getting better every week.