It’s interesting that you mention this.
I suffer from mild to moderate medial epicondylitis (golfers elbow), and have noticed a slight correlation between pain and grip.
It seems that sometimes by altering my grip, and especially when the flexor tendons are more tensed, the elbow sensation is somewhat reduced.
That has led me to ask the same question as yours.
Wonder if it’s better to post this on the injury board, where elbow pain has been a hot topic at times.
In the meantime, start stretching frequently, supplement with some decent fish oil (if you’re not already), ice the affected area(s), and maybe use some kind of OTC anti-inflammatory for a bit to see if you can get this thing under control.
These remedies have helped me some. I’m not magically cured – I have good days and bad days, but the latter are less frequent and usually much less severe than they were six months ago.