Had Stent Put In 16 Years Ago Up Now Things

Had stent put in 16 years ago up now things seamed fine had 2 stents put in May first to replace original stent second to open artery which was I knew was partially blocked previously I have been taking simastatin for last 16 years this time I also take brilinta was told I need to take for a year I was doing great up to a month ago had some back and hip pain which went away but had caused me to stop exercising for last month now have severe knee pain today can barely walk I read brilinta and simastatin can sometimes cause this side effect gonna call dr tomorrow can they tell by blood test if this is side effect I have never experienced any problems with my knee and haven't had any trauma to my knee