Yes, physiotherapy is good to teach you stretching exercises which will help your tendonitis. You should also try icing it frequently. A 2 lb. bag of frozen peas works really well, but don't use them for dinner after they have thawed out! Just refreeze. They are good because they easily adapt to the shape of your joint.
Also, use anti-inflammatories to reduce inflammation. This includes drugs like ibuprofen, and aspirin. A new one is celebrex which requires a prescription but does not cause stomach upset, or so they say.