I had severe pain in my right ear when pregnant with my first child. It was excruciating! I had many many symptoms of thyroid disease at the time, severe hair loss, BEFORE the baby was born, etc. I was not diagnosed for another 19 years!
My blood pressure was very high at the time and it took a few months for it to go away. It was later when my last child was born 16 and half years ago, did I have a similar pain again. Again I was having thyroid symptoms but still undiagnosed. (Rotten doctors!)
Often when the thyroid is enlarged it can push all the nerves, lymph glands etc to one side. There are many nerves which run under the jaw and up the side of the face and the ear, and it is these they try to avoid when removing a thyroid, as it can cause paralysis of the face. So it is very possible you are having pain due to a nerve being pushed or compressed.
Good luck!
What is your last FT3, FT4 and TSH levels.
The thyroid DOES interfere with the ears, throat, glands in the neck and sinus's.