Re: bulging disk in neck and dizziness
The spinning sensation is probably vertigo. I doubt it is related to your neck problems, but I'm not a doctor.
Vertigo is caused by a problem in your inner ear when the fluids get out of whack and pressure is put on delicate structures there. It can be caused by an inner ear infection, medications, or by chemical imbalances/pressure in your fluid-filled sacs in the inner ear. Talk to your doctor to get advice on what to do, but many doctors recommend a salt-restricted diet, chewing gum, use of decongestants such as Sudafed, and drinking lots of water. It can take weeks or months for this condition to improve, and once you've experienced one bout of it you are at risk of experiencing future bouts as well. I've suffered from this since I was 19.
It would probably be a good idea to visit your primary care doc to be evaluated and treated if necessary. Some like to run a course of antibiotics in case it is an inner ear infection. It would also be good to talk to your spine doc as they are familiar with your condition to see if they think your dizziness could be possibly be caused by your neck problems.