You should ask PT about EMS. It may or may not work for you. I used it after having my back surgeries to help keep my legs from atrophying. But even with EMS, you still need to do physical exercises. A good thing to look into before jumping into weights are those long elastic bands. They come in varying strengths and you can get them from PT as well. Great way to start retraining and reactivating your muscles.

As for protein, I take Sinemet as well but don't have the absorption problems or interference issues that some people do. I just take my meds 45-60 minutes before I eat anything, then I'm fine. I eat a very healthy diet with lean meat, chicken, fish, veggies and fruits, plus take protein powder every day, and I've had no issues. As long as I take my meds before eating, and time my meals so that I don't eat anything 2 hours before taking my meds, I've had no problems.