Welcome @lgreg, I'm sorry to hear you haven't had any relief for the PMR pain yet. Normally when you start a treatment for PMR you get some relief within a few hours of the medication. I don't have any experience with Methotrexate but do have experience with prednisone for my PMR when it was active and had relief within hours of my dose of prednisone. There are quite a few other discussions on Methotrexate and PMR that you might want to scan through to learn what others have shared. Here's a search link that lists the discussions - https://connect.mayoclinic.org/search/discussions/?search=Methotrexate%20for%20PMR.

Have you told your doctor or rheumatologist that the Methotrexate is not helping with the pain yet?