I can't recommend a doctor but I can (highly!) recommend this: http://info.thera-bandacademy.com/flexbarelbow
. It really works... at least it did for me.
You might also want to take a look at your equipment as it could be attributing to the problem. What racket(s)/strings/tension are you using? How often do you restring?
And of course technique... which could be the main contributing factor (note that pros have all kinds of injuries but hardly ever suffer from tennis elbow). Of course addressing possible technique issues is complicated, and depending on personal circumstances may or may not be feasible.