What Causes Headache,dizziness And Nausea?

I had my second reclast infusion near the end of Nov. 2013. I have had dizziness, nausea and general body aches and headaches since shortly after that time. I didn't realize these may be side effects and blamed it on sinus problems, ptsd symptoms, etc. ( I lost my son in Iraq in 2003 and suffer from PTSD and have learned to control those symptoms but still have problems at times and thought with Christmas in the near future that this was just that reoccurring.)
I contacted the dr. who administered the infusion this week and his nurse called me back and told me that I would have had symptoms within a week of the procedure so that this was definitely not because of that. I had told them that I have had symptoms on and off for some time now. The symptoms occurred some after my first treatment but not near as bad and soon got better.