What's my problem now?

I don't know what the deal is with me. This has been going on for some time now but today was really bad. My energy level is ok but for some reason just about anything I do makes me extremely weak. Today I had to just lay down because I got dizzy whenever I moved around. If I stand up I feel like I'm going to blackout. If I'm washing dishes I have no stop numerous times to breathe and regain my strength or something. Taking a shower is even too much effort. I walk around like I'm an old lady because everything I do takes so much out of me, too much. And it's not because I'm old, or even the heat, so I don't know what my problem is. I just hate doing doing everything and feeling like I will pass out because my body can't handle it. I feel sickly. This is ridiculous =/