I have unbearable pain posterity in the high hamstring area and ischial area. I am unable to sit or walk long distances. I also have an unstable L SI joint (chronic) which can cause unequal leg length. I have multiple myeloma ; have you heard of strong chemo drugs causing tendinitis? I need help. Riding in or driving a car is extremely painful. I take an ice pack with me everywhere wand have had to cease most activities. I often eat standing up... I lie down with an ice pack over the gluts and ischial area frequently during the daytime.