Ouch, strongs Jughead. I went through this in 2017, snapped my left bicep tendon clean in half trying to stop my WR250F rolling down the gorge I had just battled to get up. It also came off the bone in my forearm. It was so bad they opted to use donar tendon to replace a piece of it eventually.
If I have any advise on the recovery, it's that your biggest friend now needs to be someone called patience.