this could be caused by several different things one being something going on with your back e. g. bulging or herniated disc.
i have weakness and tingling and a feeling of lazyness in my right side (arm leg face). along with the "butterflies" occurring in my right arm leg and face. my lower right leg is extremely tired and sore all the time. for example i will go on run and my lower right leg will be sore while the left is fine. i've checked out my shoes. i've rested it for days without running and nada. it is almost as if it is really tired and just wants to stop working