I've had TE for two years. Had the full range of treatments. Rest, Physio, Ultrasound, Injection by GP, injection by specialist (that hurt like hell, but worked perfectly for 3 months) but it then came back with a vengeance.
Had surgery on it on Monday. Unable to use right arm for at least a month (off work) then 3-6 month recovery period. Probably off the bike for 3 months 8-( Can't do any bike fettling, can't even get out and take MTB pics.
Not what you want to hear!
Initially go for total rest, lots of daily icings, then try the exercises suggested.
Believe me, you don't want to go down the surgery route.
I also have it to a lesser degree in left arm.
Seems things start hurting more at a "certain" age.