Oh, trust me, hypothyroidism will make you feel like you are losing your mind. You can't focus on anything with the brain fog that comes with it. At 50, I'd get it checked, just to see. Tell your friend her TSH should be between 0.3-3.0 and to check it herself because some labs haven't changed their values. I had all the symptoms for 6 years because I was right at 5.0 and the lab still considered that adequate. I can't function well with a TSH above about 0.40.