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Graves disease is associated with depression. But before concluding it to be the cause for your depression, I would advise you to do certain tests to evaluate the thyroid function at this stage. Its important to know whether it's your thyroid over activity causing you the depression or it is something else. I would recommend you to test TSH, T3 and T4 . depending upon the current thyroid status , treatment for depression can be initiated.
If it is the thyroid problem causing the depression then mainstay of treatment would be to control the thyroid functions with appropriate medication. In most of the patients keeping thyroid activity under good control will relieve them of depression and other symptoms. If the depression is not related to thyroid function confirmed by the lab results, then you will need to consult a Psychologist first and opt for counselling. Simultaneously you could consult a Psychiatrist and discuss about the medications you’ve been taking so far for depression.
Every anti depressant medicines will have its own side effects, and tazadone is FDA approved for treating depression. Tolerance to a drug varies from one person to another. If you are not feeling any improvement with the current medication or if you are not tolerating well, then you can talk with your psychiatrist to change over to a different drug. Trazadone is an antidepressant which has long half life that means it keeps you asleep for whole night. Hence some people find it useful to treat insomnia problem as well. side effects of trazodone are Nervous system side effects are common and include drowsiness and sedation in as many as 50% of treated patients. Dizziness (10% to 30%), sleep abnormalities, headache, fatigue and, more rarely, seizures. Not everyone experience side effects. Some tolerate trazodone well whereas some develop side effects. So what was mentioned on the websites may not apply for all. Treatment for depression Is personalized according to severity and tolerance to various anti depressants. Before you change over to any drug you must consult a psychiatrist because sudden withdrawal of a drug can cause withdrawal symptoms.
Hope this helps. Please feel free to ask if you need further help.