Feeling tired all the time all day, dizziness,anxiety?

No matter how much sleep I get a always feel tired all day long. Very forgetful and it takes a lot out of me to get something done around the house or to even get out of the house. My son is 16 months old and I take care of him all day and he is fine and healthy. I play not for long before I just need to sit down. I feel so bad that I am this way what shall I do. I have a mild underactive thyroid also but not on meds due to insurance issues. Could there be something else wrong with me anybody going through the same?