Cycling moods

I've been cycling moods lately... depressed, then okay, then back to depressed. I went for a walk today and that helped me some, but I'm still depressed. I could only walk a quarter of a mile before I started hurting, so I turned around and went back home. So all I got done today was half a mile. Better than nothing, though. I made "fried" baked chicken for dinner and it came out okay. It wasn't enough for Geo and I, so I made up some stir fry as well. I slept for a large part of the day. I told myself that when I wake up tomorrow at 11 or so I'm going to stay awake. I can't keep sleeping 15-16 hours on weekends when I don't need to sleep that much. I love to sleep, though, so it's hard. Especially when I'm depressed. 
*sigh* I wish that there was something I could do to prevent these moods... I'm good on my meds, but this is like a breakthrough symptom. It's just temporary. I just want to curl up in bed and cry.