Hi Joyce:  Can you take your list of medications to your pharmacist, or better yet call them so you don't have to drive, so they can tell you what you might or might not be able to take for pain?  They should also be able to tell you if you are taking anything that would be contraindicated with Reclast.  Below is an article on Reclast that list all the common and adverse side effects of Reclast.  Within that article it should list any medications that are not to be taken along with Reclast.  One of the main issues would be if you are allergic to any of the ingredients in Reclast (zoledronic acid).  

You could also try resting several times a day or more often, by lying down and giving your back a break.  Using 15-20 minutes of heat or ice, which ever you prefer, should help quite a bit.  If you lie on your side while resting put a pillow between your knees; this helps to take the pressure off your spine and also helps to realign it.  If I don't use a pillow when I rest (between the knees) I really notice the difference, because the pillow helps tremendously with the pain. 

There are also topical analgesics that you could apply to the painful area, and since I've tried almost all of them I like BioFreeze the best, which can be purchased at a Medical Supply store or a Physical Therapies office, it comes in roll-on, spray and gel.

New England Journal of Medicines Study on Reclast

http://content.nejm.org/cgi/content/full/356/18/1809

Here's an article on Reclast from Dr Gonter here at HealthCentral

http://www.healthcentral.com/osteoporosis/c/73/13598/reclast-acid

Good Luck and I hope the pain goes away soon.  If the pain persists look into another answer to the source of pain like a possible minor injury.