I know the question of is it pain causing weakness is hard to answer, but I can conpare what I could used to do with my legs now as to before and it sure seems like weakness to me. Also, there are a few who have been diagnosed with PMR (and are being treated as such) that don't have pain, only weakness. Have they been labeled incorrectly? Maybe, I don't know. My mind is still open. I'm sure sorry that you have GCA, that's scary. I'm always conscious that it could happen.