What Causes Dizziness And Black Outs After Receiving Steroid Injections?

Hello. I had a proceedure 2 months ago. It was steriod injections in my c6,7. The pain has been so much worse since then. It pops now and when it does i get dizzy everthing starts to go black.and now i have frequent migrane headaches which i never had before. The dr said it went fine and gets real defensive when i try and talk about it. He has upped my meds from tramadol to hydrocodone 10 325s starting after the proceedure.what could have went wrong. And how do i go about a 2nd opinion when my insurance wont let me. I have not been able to work since the proceedure and i was working up untill i had it. Due to pain and the almost passing out when it pops. I drive heavy equpitment and it is to dangerous.if i pass out. Plus the narcotics im on. Ive tried going without them but thepopping and dizziness is still there and pain that makes it feel like my neck is breaking. What do you think he did in the proceedure to cause this.