juned.ahmed: Do I have Thyroid?

Hi guys!
Maybe someone can help me. I've started thinking I have thyroid.
Yep, i've been to a doctor, (two doctors in fact) though I feel I can trust them. I'll tell you why, but first I think I should talk about my symptoms:

My whole body tremors. I think it is called Physiological tremor. And it seems it can be due to hypoglucemia, thyroid, or brain tumor, among other causes.
In my case, tremor is not noticeable by other people at first sigt. But if I need to hold a piece of paper with my hands, you will notice my hands tremble.
And when I put my make-up my fingers and hands tremble.
Or sometimes the things I am grabbing fall down to the floor.Sometimes almost fall and I am able to hold them.
At nights, while at bed, I also feel the tremor, and my heart goes superfast, whole day I would say
What my doctors said:
-My NHS doctor: said it is because of stress. But then months passed and I was still trembling. So, I had a blood test. According to my doctr, the test is Ok. Glucose was a bit low, but ok. And TSH (thyroid) was ok.
-The neurologist: said that I might be overworried or stressed. That I sould go to a psychologist. Coz he thought it could be stress or depression.

BUUUT
I feel happy as always, I feel not stressed. So, I can not avoid thinking the neurologist may be wrong and also NHS. Why?
Coz years ago my mother had surgery because of thyroids. She had had lots of blood tests during ages, and TSH was always ok. Till she started to be unable to breath ok. Then she had an echography and they found a thyroid with tumor.
That is why I don't trust what my doctors told me.
I've started thinking I may have Thyroid.
And I've started thinking that until it gets worse, doctors won't be able to realize that I am ill.
Do doctors need to wait till the last moment? Are they unable to get a correct diagnosis till evidence tells them are ill?!
SO,
What do you think?
Anyone in the same situation?
(SORRY because of such a long and detailed post. By explaining the whole story is the only way I can be understood).