Thyroid glands constantly up!!! Tired alot! stress?!

Ok well im 16 and since the end of November my Thyroid glands have been up. One of them appeared at the bottom of my neck with no pain, it moved when i press it and it is hard. My other one is in my neck harder to feel, but its like the other one but not as big. Then a recent one under my chin which at first was a little tender to touch. However it isnt now. In november i was off school with a fever and feeling ill and loss of apitite. But its March and i feel fine most of the time. Now and then i heat up and my glands will rise but thats not been a while. Then again back in november i suffered a very acute pain in my left side of my chest. Then it followed on rarley after wards. A quick pain but very agonising. The i got it every other month. I havnt had this pain for a while, maybe since december or january. Now and then i get achey joins, and my neck was very sore last month i could barley move it. And then about two weeks ago my arm hurt like a burning muscle pain. But apart from all that i havent had any pains latley and i have been feeling fine. Apart from the fact that i lack energy, concentration and that i am almost tired, depending whether its a good day or bad. I am under stress latley from school ect. I went to the doctors in january and he felt around my neck and said i must have a cold, but they havent gone down and i feel fine. Its just bugging me, its probaply nothing but it would be nice to know why my glands are up. I hope you can help. Natalie. Ps: The achey joint maybe related to bad sleeping positions because they went after aday or so. But i dont know.