Hi there. I just means your thyroid is not looking like an everyday thyroid, with some lumpy bits along the edges.
It could be due to Hashimoto's If you are having that 'in the throat' feeling then it is probably time to get it out! Often after many years of working by itself, after losing one side, the thyroid does tend to start to give up.
You don't mention any Free T4 or Free T3. Have you had them tested? These will definitely show if your thyroid is starting to die off.
Cheers
I would question the Endo first!!!! Wish i could help, but i have noo idea what these things are except the TSH appears to look normal.