Moved here from Bike Mechanics.
You might want to try moving your seat back just a little. Peter J. White has a procedure for setting seat setback that has worked for me
https://www.peterwhitecycles.com/fitting.php
Raising your seat is similar to moving your seat back. Note that if your seat is the right height, you probably need to drop it if you move the seat back.
I get elbow pain sometimes. Probably for similar reasons the OP is getting tricep pain: need more strength in those muscles. Pushups help a lot. They also help neck soreness.
Some of you people must go to your physicians a lot. They probably have a note calling you a hypochondriac. I would never think of going to a physician for something like this. 97.5% would tell you to ride less. They
might refer you to a physical therapist.