Muscle shooting pain last 2 weeks. Any stretching, over exertion or extension causes muscles to lock up for a minute or more. What is causing this?

Doctor can evaluate. Odd changes in muscle activity and muscle behaviors are hard to figure out in words. One can go to his primary care doctor and show the doctor exactly what happens. The doctor may then refer to specialists for more evaluation, if needed. The doctor will need to know all the medications, vitamins, supplements, etc..., being taken. Some lab tests may be done to see if the blood chemistries are ok.