SI Joint Nerve Block

I suffer from chronic back pn post motor vehicle accident 17 months ago. I had a Sacro Illiac Joint Nerve Block and Cortosteroid injection 6 days ago. 2 days later I started feeling tingling in both my feet and increased pain in my SI joint. On the 3rd day I started feeling tingling in my lips and tongue which has not stopped. The center of my forehead to the tip of my nose feels numb, my lips and tongue are tingling, both my hands are tingling and both shins and the top of both feet. I have a severe headache which started today. I am taking Celebrex, Tramacet, Cyclobenzaprine and Nexium, the pharmacist assured me that none of the medications would cause these symptoms. The Dr who treated me has not returned my phone call yet and I am considering going to a GP. Any ideas about what might be happening?