Thank you for your replies.
Specifically, what things did you do to recover? I am not good at lying around the house so, fortunately, I am able to do my full core and arm exercise routine and standing doesn't bother it (meaning that cooking isn't a problem). Walking even a short distance irritates it so that eliminates even going to the store. Plan B: Discover what I CAN do, and do those things.
I would not have surgery unless absolutely necessary, which I doubt (it doesn't appear to be a full-thickness tear or avulsion). It's highly likely the right hamstring is torn as well since I have the same (but much worse) pain on that side, and a new MRI of the right side is already scheduled for next week.
I resorted to upper body and core exercises and included cardio using a hand bike at the gym. As for treatment, a combination of a walking cast, frequent elevation and ice packs, a lot of accupuncture with electro stimulation, laser to increase blood flow and Graston physio to breakdown scar tissue. This went on for a year, after which, I was able to ride pretty much normally. Good luck.