What Causes Stiffness Along With Pain While Straightening The Leg?

hi I am facing a lot of problem since 1 year in standing immediately after sitting , i am 24 yrs old female , this problem started first with heavy pain when straightening my right leg exactly in my gastrocnemius muscle , later it keep on spreading and made the situation worse to stand up straight and get us and effected my moments of lower body , the pain spread in glutes maximus muscles and in my left gastrocnemius muscle also but comparatively right side is unbearable , teres minor and major muscles , it started paining in hands movement especially raising hands , and the pain in teres increases every time after taking bath . how ever the other pains are constant . i don't know what to do in such case . please suggest me something .