You have my sympathy. Different instrument as I play a wind instrument, but I had problems with RSI a couple of years or so back and was told by my doctor to stop playing for a while which I did for about 4 months - definitely suffered withdrawal symptons during that time, but it did the trick and gave the body time to start healing. Even so it took about 2 years for my wrist and hand to properly recover and I had to be careful not to overdo it during that period. I think my problem arose more from overuse of a computer keyboard than playing recorder, but the two probably aggravated each other.
I am sure a visit to your GP will help even if she is not fully aware of the hazards of playing guitar :-)