I would agree with katemn, to see an endocrinologist. Please know that all endocrinologists are not as interested or versed in hypothyroidism, and/or are not as good at "considering" patients' symptoms. The one I visited in NC was terrific, patient-centered, knowledgeable about and interested in hashimotos type hypothyroidism, and up to date on research. The endocrinologist I have now (mandated by my insurance plan which does not let me choose another) appears to be very uninterested in thyroid issues, and is not very good with patients. My TSH is not so high, but at a "2" (range .5-3.5 at my lab is "normal) I am extremely symptomatic but this Endo will not increase the dose of Synthroid and has not mentioned trying something else. I have read that the natural thyroid hormones are harder to titrate and control than Synthroid, which means levels must be checked more frequently if you have a history of arrhythmias. If you can find patient ratings of your local or regional Endocrinologists, you may increase the odds that the one you ultimately visit will be respected & recommended by patients with hypothyroidism issues. Good luck! Glad you are feeling great at the age of 80!