Pain where the Legs Start. Left pains.

I'm Suffering with Pain at the Part below the Back bone that is Back side at the Joint where the Legs Start on both Left side and Right Side from about 50 Days, I've Used Some Tablets prescribed by a Rheumatologist for 10 Days, only at the Time when I used The Tablets I'm Normal, but then when I stopped The Usage of Tablets, the Pain started again and Increased. The time when the Pain is More is at when I Sleep and at the Time after Waking Up from the Bed. I can Walk but I can't Run and Can't do Higher Movements n also I can't Put it to Strain, Only I can Walk slowly that's it. Sometimes the Pain Comes on the Front Side and Sides also but on the Front Side only Right Side pains but on back Both Right and Left pains.