Should I go back to the doctor about my thyroid nodule?

About a year and a half ago it was discovered that I have a thyroid nodule. One blood test last summer (2008) showed that my thyroid levels were slightly high, but not enough to warrant medication. These tests have been repeated several times since and have always come back normal. Last February I had an ultrasound which showed a nodule about 1 cm large. My doctor said he could biopsy it if I wanted to, to ease my mind, but he didn't seem that concerned about it so I declined. The past few weeks, I have had a cough and I always feel like I have phlegm in my throat, especially after I eat or drink. Also I occasionally feel a slight stabbing pain in the fleshy part of my jaw under my chin. Today I noticed a few enlarged lymph nodes in my neck, but I also had a cold last week so that may be why. Also I have had occasional chest tightness/shortness of breath and dizziness over the past few months that the doctor blamed on anxiety as my husband had it too. The cyst on my thyroid is large enough so I can feel it, but I can't really tell if it's gotten any larger or not. If it has, it is only slightly. There is no history of cancer in my family, but my mothers paternal grandmother had her thyroid removed when she was in her 20's (my age) but my grandfather was too young when it happened to remember why. I really don't like the doctor I have right now and I feel like he doesn't take me seriously so I'm kind of afraid to go back. He was not the one who did the tests on my thyroid, etc and I cannot see that doctor as I have since moved across the state. I know that thyroid nodules are rarely cancerous, but I am really scared. Do my symptoms warrant going back to the doctor or am I just being paranoid?