Not to worry, NO question here is stupid, it makes perfect sense. I know if it was me, I would call the Doctor who gave it too you and ask why the meds if there isn't a problem. I would also have another Doc check it out as well.
The weird thing is, I was posting on here not too long ago with the same symptoms, I thought for sure it had to be from the surgery and a nerve was compressed. But my Surgeon took 5 Xrays (I went in after I couldn't walk anymore) and he told me I had Bursitis in my left hip and gave me an injection of Novocaine and some kind of steriod mixture directly into the hip.
I got home and online, I didn't have one single symptom of Bursitis, but I did find the symptoms were for a compressed nerve.
24 hours later I had no pain at all and a large area of water came to the surface, so I guess he knew more than I did.
Have you had an MRI done? If that one says it's not a nerve, you might want to ask him about the muscle and joint in the hip.
My pain began in my lower back and over to my left hip and down my leg as well.
Good Luck to You, I Pray it's not a compressed Nerve, but if it is, He does the right test to find it.