I was going to ask if they were nodes or nodules. Very different - both for the thyroid area, and also for behind the ear. The US should tell what is there behind the ear. A doc can probably tell fairly surely during an actual visit in person, depending on where exactly it is.
Cancer would be the least likely. Since it's not same side as the tooth, maybe it's not a node either. Just some benign mass or cyst (fluid).
Okay, so they are nodules inside the thyroid, not nodes downstream from the thyroid.
"How I wish I can do the UT sooner just to relieve anxiety.."
You can try to find a walkin ultrasound place, maybe you can get it done tomorrow. Or else a doc's office with a portable ultrasound. You don't have to be bound to one particular place. Tell the doc who wrote the order that you absolutely cannot stand the waiting. You do need an order for the US that you can take/use anywhere.
Sometimes a med practice wants you to use their place, so they get the profit.
I would want an ultrasound instead of a CT. At one inch, it's big enough so that if it is an enlarged node, then the US will see what it is like inside. Also, it is right at the surface, which is good for a US. You also probably can get a US much sooner than getting the CT.
Both US and CT can see the shape, which is a big factor; you want it to be oval, not rounded.
But is the CT is without contrast? That's almost a waste. It can see the shape, but not the internals.