re: right side of my chest/right tricep giving out

Went through a similar situation with my left side a few years ago. Never had a proper diagnosis but all signs pointed to Nerve Impingement. Made a few trips to a chiro who specialized in sports medicine and learned some “nerve flossing” stretches on YouTube.

Coincidentally I had to take miss a few weeks of lifting due to work around that same time, and I believe that’s what actually cured it.