Muscular pain in my right arm and elbow and shoulder , also much pain when i raise it . it lasted for 2 month.what're the possible problems ?

Several possibilitie: You need to see a good orthopedist or physical rehab doc, and get a diagnosis. It's hard to tell you what is wrong without doing a careful physical exam. That's why we learn how to do these exams and learn the orthopedic tests that we perform on patients to make a diagnosis. This could be a problem with the rotator cuff tendons in the shoulder or muscle trigger point knots. Please consult with dr.