I am concerned.....

After a long day of teaching, I get home and I don't want to lift a muscle. What is wrong with me? I try to accomplish things early in the week. Then Wed. and Thurs. comes, and I lose it. I have no motivation. I used to love to work around the house and keep it tidy and organized. I used to LOVE to cook. Now, I loathe to do it. I am so backed up with the laundry, its not even funny. I still have to change and wash the sheets in our guestroom from our friends visit in late December! I do my best to catch up during the weekends, but I can't catch up. Weekends seem too short. What do I need to do to get more energy? This is very concerning. I don't know what else to do! What will happen when we have children? I need to get a grip on myself. HELP!