I had this same problem and still kind of do.
Used a therabar and did twists to strengthen my forearms as it was tennis elbow , it got so bad at times it literally would cramp and lock which was the nerve.
Used BPC, took 10 days off of all upper body, and then went back slowly using bands to work my tríceps and biceps working the full ROM and I did high reps at a light weight to get blood into the tendon… IE 50 reps of band push downs for 2 sets.
Used sleeves for a good year as well they really helped, got the mark bell sleeves.
Also would use a heating pad on the couch to get blood flow into my elbow.
Each day I used my USL it’s an ultrasound machine that creates heat and helps heal injuries.
You get tight forearms and it makes your elbows hurt, so they are overpowered and using too much stress.
I would say try out fat gripz too they take off a lot of the pain and will build up your elbows. The blue fat gripz are the ones I use and they’re amazing.
You definitely need to rest it but don’t rest too much on it because after 2 orthos views if I did that then even less blood goes to the tendon, so I hit the triceps 3x a week with high reps on the bands along with the therabar and it really fixed them up.