What Are The Activities To Be Avoided To Hasten Healing Of Tennis Elbow?

Hi,

I am an over 50 (age) stay at home wife and have been diagnosed by my doctor as having tennis elbows on both arms. He has prescribed rest and some basic exercises and said that it might take upto 6 months for the healing.
What can I do to make it heal faster? What activities are best avoided? Can I go swimming or to the gym? Thanks