I'm not a doctor, but I can give you a little advice about this as someone who has been through something similar. I was diagnosed and treated for thyroid cancer in 2006 after a year and a half of tracking a single nodule on my thyroid. (If you specifically want the doctor's attention, you should click on the "Ask a Doctor" button at the top of the page and submit your question there).
May I ask, what does your doctor say about all of this?
Anytime they find a nodule, it has to be treated seriously. These things shouldn't be ignored because they can be something serious, even though the majority of them are not. The fact that you have multiple nodules makes it a little less likely that they are cancerous. How many ultrasounds have you had? They usually want to do more than one, spread out so they can see if the nodules are growing, shrinking, or staying the same. Have they done a FNA biopsy?
My advice would be to follow-up with your doctor. If you are not under the care of a specialist (an endocrinologist or an ENT--either with experience in treating thyroid nodules and cancer), you should be. A primary care doctor isn't the way to go with this.
This is probably something you will have to have watched for a while, maybe indefinitely. I know it's scary right now (I've been there), but they are probably benign. Personally, I found that doing research into the topic really helped calm my nerves. It convinced me that it was probably nothing and if it was something, I could handle it. And I did.
I would also advise you to write down all of your questions for your own doctor (after you do your research) so you can have them answered by someone who can actually examine you and follow-up with you. The more you know, the more you can participate in making decisions about your own health care.
If you have any other questions, please feel free to post again. Sorry I'm not a doctor, but I hope I was able to help anyway. Good luck with everything.