Yes, I Was Just Put On Mobic For My Knee

Yes, I was just put on Mobic for my knee which had gotten very painful from over use up and down a ladder during painting. It got so bad especially in the back of the knee. The Dr. ordered an exray and he said was mild arthritis and put me on Mobic bid for 2 weeks. I am not convinced it is just arthritis. However my question is I take a couple other medications. One is Tizanidine genric for Flexeril a muscle relaxant taken for sleep and also an occasional Hydrocodone-acetamenephrine 325-10 PRN for back pain and Fibro Myalgia pain. Is it safe to take these two current medications with the generic Mobic. I think the muscle relaxer is ok but am concerned with the acetamenaphren in the Hydrcodone. Please respond. Thank you very much,
R. L.