Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. You may be suffering from acute gastro esophageal reflux disease with muscle strain or bruising or sciatica or bursitis or pyriformis syndrome or herniated disc or degenerated disc syndrome or sacrifice iliac joint dysfunction or peripheral vascular disease etc. Until examination is done it is difficult to say what it is. Apply ice or heat to bring down swelling and relieve pain. You can use one or the other, or switch back and forth between ice and heat. Hold the hot or cold pack to the affected area for about 15 minutes at a time.Do gentle stretches of your legs, hips, and buttocks. Rest to give the injury time to heal.Take over-the-counter pain relievers, such as Naproxen or Ibuprofen . If symptoms not improved please consult your doctor he will examine and treat you accordingly. Hope I have answered your query. Let me know if I can assist you further.