Low back pain after heart cath

I had a Heart Cath on Sep. 18, did find the first day after on the 19th, but on the 20th during the day I got real bad right side low back pain, the cath was done on the left side groin area and I have no pain or burising in that area, and it looks real good. Back pain is bad thou, I had this same pain before when I had a heart cath. I called the doctor and they told me it wasn't anything to do with the heart cath, but I'm wondering because this same pain happen before. I have no fever or any place's that would look like a blood clot. I can't even stand up straight. I have CAD and two stents. Thanks

[Paris5529]

I had  cardiac catheterization on 10-2-09 last Friday.  It turned out it was fine.  Next day went for a drive with my huband did some walking not alot.  Next day went to a picnic mostly sitting.  Last couple of days have had lower back pain on my left side.  Could this have anything to do with the procedure?  Go to my doctor on Friday.