Fatigue

I am just so tired. I try getting up and doing things but I wind up just sitting down from exhaustion. This is sooo not me. I used to play softball, take lonnnnggg walks, hike in the woods and by the lake. There are so many things that I used to do and now just can't seem to do. I wish I could make people understand how hard it is for me. I feel like I'm on the verge of going to sleep all throughout the day. Does that explain it? I wonder.