My Recent TSH Was .37, The T4, Free And T3,

My recent TSH was .37, the T4, free and T3, free were normal. I feel tired and lack energy. Not sure if it is do to the low TSH or the fact that my husband has had serious health problems the past two years, aortic valve replacement, shingles, right leg amputation, pneumonia and now had the tip of his middle finger on his right hand removed. Maybe the stress is getting to me. I will be 75 in Nov and have always had plenty of energy and enthusiasm in the past. Should I be concernd?