Sciatia

I was told by my doctor thatI have sciatia pain in my right buttocks and leg stemming from riding on the back of a four wheeler over the July 4th weekend. I have had this pain for four weeks and feel that I no longer can stand it.
I am taking 10mg. prednisone for Cutaneous Lupus and 15 mg. of Mobic for osteoarthritis, but nothing helps. At night I was taking Darvocet but have to watch my Tylenol intake as I had some liver enzymes that were a little high this last fall, everything is OK now, but don’t take the Darvocet unless I really have to.
I started physical therapy this past Monday and had another hour of it Wednesday and I feel like I am worse from all the streatching exercises.
The front of my leg on the shin is the worst part of the pain. Also have pain in a muscle in my buttocks(Piriformis) I guess is the name of it. I also had some groin pain and still do at times.
I have never been to a chiropractor and was wondering if I could be helped if I saw one.
I do have osteopenia and wondered if that would be a draw back to seeing one.