My TSH level was rarely checked by doctor ... 3 times in 6+ years.  What makes level go from 0.245 to 6.8?

I'm a 54 year old woman being treated for clinical depression, hypothyroidism, and trigeminal neuralgia. Have complained repeatedly to doctor...

I've been treated with tegretol for TN for 2 years, and there are side effects I find unpleasant.  My dental care is provided by a county clinic...