I am a licensed Massage Therapist [32 years], and I have treated several stroke patients who were continuing to experience pain following a stroke. Active Stretching helped them relieve and/or eliminate the pain. The pain you are feeling MIGHT be from muscle spasms. If so, gentle ACTIVE STRETCHING might ease the discomfort.
If you are being muscle tested and are told your muscles are weak and must be strengthened, doing strengthening exercises could be reinforcing muscle spasms and causing pain. In this case, the muscles must be relaxed, not strengthened.
I hope this is helpful.
PS: I am a stroke survivor myself. 3 TIAs. Self-massage helped me recover quickly.