You definitely have to address your anxiety first and foremost. You are too hypersensitive toward the sensations that move through your legs and are essentially looking for trouble. And with the hypochondriac brain - where you seek, you shall find. Treat your anxiety, change your focus, and I bet the pain goes away. I have had many pains that I swore were coming from the illness that I feared: when I dealt with the anxiety, surprise, surprise - the pains were gone.
8-9 negative ultrasounds indicate that you do NOT have a clot. So there it is, no clot!
Even if you rushed to the ER right now and demanded an ultrasound on your leg, your fear will not be fixed. You will wake up tomorrow or the next day and wonder if you have a clot that
day until you're to the point when you start wondering if it would be best to get one every 12 hours just to be sure. If you feel the urge to go to the doctor, make the appointment with a mental health specialist that can help you get back to living your life without terror every day.