Synthroid and bananas

I was born without a thyroid gland so I can't compare the way I feel now to the way I would've felt with a thyroid. I've been on Synthroid my entire life (22 years), and I'm up to 112 mcg now. I am very skinny (5'5", 104 lbs) and feel constantly fatigued no matter how many hours I sleep, what I eat, and how much exercise I get. I periodically get pain in my hip joints, heart palpitations, and intense mood swings. My thoughts race but I have very little physical energy. I feel restless and gloomy almost all the time for absolutely no good reason. My doctor tells me I'm depressed but I honestly have no reason to be depressed and I wish she would see it as a symptom instead of a diagnosis. I graduated from a good college, I've got a job I like, I have friends, I enjoy life and my hobbies, yet I feel overwhelmingly sad. This does not seem like depression to me.

I find that after I do aerobics I get a tightness in my chest, which makes me worry about my heart, but again my doctor doesn't seem to think this is cause for concern. I have been irritable/fatigued for YEARS and I suspect I'll feel this way for the rest of my life. The worst of it started when I hit 16 years old and started the 112 mcg. My tests are always normal and it frustrates me that my doctor disregards my symptoms. I've tried other doctors, but they always send me away with my 'normal' test results. Can anybody help?

i've been on synthroid for 9 years. started at some low dose and gradually went up to112 mg. get extreme itching all day everyday if i don't take allegra for that.not a rash just itching. that doesn't bother me as much as the fatique. every joint in my body aches all the time. sure there are better days but fo rthe most part it's bad. tried physical therapy and chiripratic care but no avail. they ended my sessions. my legs get sooo weak and my feet burn lower back really aches. sometimes muscle cramps. i'm very negative towards my loving family and it hurts me to do so. can't seem to keep upbeat. soo tired all the time.
is it the syntroid? i used to be very energenic and a doer. now i have spurts of activity in the morning , but then i just can't get motivated. help me any suggestions?