Symptoms:lack of concentration, change in personality, irritable, headaches, cannot focus, no interest in life, tired, forgetting words, dizzy, backpain?

Check thyroid: First dheck thyroid, T4 and tsh. Also check cortisol and acth. If you are taking estrogen progestin birth control pills, stop them.

Depression: Make sure that you get blood tests and be evaluated by a family dr. To exclude other medical problems. In addition, you may be suffering from depression and will need to see a psychiatrist also.