Always a good idea to get a proper assessment from a physiotherapist / rehabilitation specialist if you have not already. Most have experienced elbow/shoulder issues at some point if lifting long enough / pushing for progressive overload / etc.
1. Find out what is potentially causing it. Often I take a week or two off and just do the rehab exercises.
2. Back to the gym, lift lighter and avoid the exercises that aggravate the issue. I do the rehab exercises before I get into my workout.
3. As you progress and get better, take it slow. This is a turtle sport and can't expect to get better from a chronic issue in weeks to even a few months.
4. I found both BPC157 and TB500 helped but were not a magic cure. They helped me get back to where I was before. Often if my shoulders were sore - per @CoolRick and @Cheapshot - you may need to concentrate on other body parts as you may have a muscle imbalance that is putting undue stress on the elbows. For my shoulders, I never really noticed until I was assessed and put on a regimen of exercises to do for a few weeks with no lifting and then before each workout. My chest muscles were pulling my shoulders out of alignment and after a month of strengthening the muscles that help keep my shoulders in proper position, I was able to add in exercises that once made them sore. Again, low weight and build up.
Massage / osteopaths / chiropractors / physiotherapists who lift and have been through the same issues seem to be the best. My osteopath was a top level Canadian powerlifter hence he could relate.
I am not the least bit against BPC157, TB500, HGH to help heal quicker but if the cause is not removed, you will end up getting better and then re-aggravating the issue.
Good luck - suspect you are among the group who have been pushing the limits for years. As much as time off sucks, it can be a necessary evil with active healing - continue to stay active for the blood flow like cheapshot said.
Supplements that help with inflammation / blood flow should hasten your recovery.
Good luck