First and foremost I would visit an osteopathic doctor, they are hands down the best at diagnosing muscular skeletal imbalances in the body and by using extremely gentle manipulation (as in can't feel a thing) can right little wrongs. Whenever you are experiencing pain in a hip this is something to definitely pay attention to because the pelvic area is the center of your body and attached to absolutely everything - back, legs, buttocks, knees, hips, everything! If there is an issue you must find it and address it directly, your osteopath will know what to do. For my pelvic issue I was treated with manipulation and PT and if it wasn't for that I wouldn't be walking today.
As for shoes, something remarkable happened when I went to the running store to buy running shoes. They put me on a treadmill and videotaped my feet as I ran. When I saw it I saw exactly how my foot was falling on the ground and it became quite obvious that I cannot go without considerable arch support.