I can't take this anymore!!!! please help?

I've asked quite a few questions on here about my thyroid problems, because the only thing i have to help now is the internet, no doctors have ever helped.I've seen over 30 different doctors on the NHS and they were all useless and they didn't even care. I'm just at the end of my tether with this illness, i have an under active thyroid and i'm 16. I've had it for a year and it's just completely destroyed my life. The symptoms i get just scare the hell out of me and no one in my family takes me seriously and neither do the doctors. I kept telling them it would only get worse if i didn't switch medications (i'm on levothyroxine now) and i've had more symptoms appearing and none of the doctors even care. I wanted to go onto Armour thyroid but i got told i have adrenal fatigue and i can't go on it until i have taken these things called nutri adrenal extra for 4 weeks prior to going on armour. Apparently it's dangerous to go onto it without fixing my adrenals first but i just can't do 4 weeks on nothing, even though my tablets don't work, i feel more exhausted if i don't take them. I've just gotten worse and worse and it's made me feel like i don't want to live anymore. I haven't been to school for 8 months and i haven't left the house in months either. A lot of my hair has fallen out, my hands and feet are always freezing cold, my thyroid is swollen and recently i've got a hoarse voice which is worrying me so much. iI have insomnia and awful fatigue, i have constipation and irregular periods too. And all the doctors just say, oh they'll go away in time, but actually they wont, i'm sure that most of them wont reverse themselves like the hair loss, i've read peoples hair doesn't grow back and their thyroid stays swollen and their voice is hoarse forever. I just can't take this worry anymore! I never get any reassurance or advie from anyone. And most of my questions on here go unanswered. I cry everyday and i don't know what to do. I have constant arguments with my parents because they don't understand at all. Please help