Re: Could a nodule even if it was cancer cause all of these symptoms??
People with hashis tend to have enlarged lymph nodes in the neck. Ironically, I had enlarged lymph nodes (found during surgery not noted on ultrasound which was just of thyroid only), and thyroid cancer (no hashis), but my lymph nodes were actually benign. Some people just have enlarged lymph nodes in general---I am one of those people.
I never read anything about lymph nodes prior to thyroid cancer, so I can't help you there.
I doubt you have cancer, but if you do, please know that this cancer is easily treatable and curable, so different than other cancers. You will lead a long healthy life even if it were. I'm almost 9 years out, hasn't changed the course of my health or life thankfully, just a yucky bump in the road. Go out, enjoy the world and life, try not to waste too much of your life and time on this right now, just take it one small step at a time. Don't overwhelm yourself, there's nothing to be gained.