I have had issues with elbow pain. It all goes back to the forearm, particularly the extensor carpi ulnaris, so not the elbow joint itself, although that's where the pain is felt.
Solution is massage and especially stretching. There are heaps of stretching vids on da interwebs. Just use the google. They work great. Takes about a week of regular stretching to sort it out, but then you need to keep it up to avoid flare ups.
It's a muscular problem, so nandrolone won't fix it. There are some useful vids at the bottom of this article:
https://www.t-nation.com/training/lifters-elbow-the-cause-the-cure