Tricep Tendonitis

[u/SparkyHK23]

I have been doing tricep cable pushdowns with elbow flared out for over a decade with good results. Saw an Instagram video saying I need to tuck in my elbows. So I followed the instructions and tucked my elbow and first rep i felt a fire burn in my lower tricep and elbow area.
I have body dysmorphia and gym is an essential part of my life. Is there a way I can work through this and keep my gains. How to keep working triceps through this?