I'm experiencing the same thing. I took a test and it did show that I'm anemic. I also think I need B-12 shots, but my doctor won't listen.
One thing you should do is to get in fruit and veggies and make sure you are eating lean protein. Also, you need to do 2-3 short workouts a day to energize yourself. It may mean just taking 2-3, 10-15 minute walks.