I have severe to unmanageable pain in my right buttock and upper leg area. There is pain with sitting and walking. The pain is unbearable if I step up with that leg, as in a curb or steps--it feels like the muscle is ripping apart. I have had hamstring injuries before, but this is much worse with no known mechanism of injury.
Hi, I am really concerned about your pain, it looks like performs syn Chat Doctor.  The causes of such irritation may be many including sacroiliacs, old healed lesions of muscles reactivated or many. You are advised to consult an orthopedic expert to confirm, investigate and treat accordingly. Hope I have answered your query. Let me know if I can assist you further.