About 1.5 months ago I tore both my brachialis muscles Grade2 interstitial tear and ruptured tendons. Not full tears so I escaped surgery. I wouldn't recommend taking time off but definitely a deload week. Keep blood flow going to the tendons but no real stress. BPC157 and TB500 can help but they act better in a recovery plan, if you keep straining the injury they may not work as you want.
If you are on a statin see about going to a lower dose, a different statin, or drop it for a pcsk9 inhibitor.
Consult an ortho. They can help pinpoint the cause and prescribe an effective regimen.
Also take the weight down a bit and focus on slow eccentrics - eccentrics build tendon strength.
I did BPC157, TB500, collagen peptides, switched to a pcsk9 inhibitor from a statin, started doing eccentrics in evey arm curl variation imagineable as soon as my arms could handle weight again, and added in stretches. Almost back to 100% with absolutely no pain, in fact my arms feel better than they ever have.