Tried to keep my elbow really straight and it was working... until I played two days in a row. Suddenly on day two very bad golfer's elbow. And arm still hurting a few days later. Something like pushing and rubbing against my head has actually caused very slight elbow "pain" for a few months I guess. But arm has been fine with tennis lately until playing two days in a row. 

Worried I'm working my way to needing surgery. Next I play going to try a eastern backhand grip and a cricket style pitching motion. This way my hand will never be behind my elbow, which hopefully should stop any additional elbow problems. 

It had seemed like keeping my arm straight with a continental grip was going to work very well but I guess not. Maybe I need six months off. But going to try this cricket style thing first......