Tired

So tired, ALL the time even after sleeping for 8 hours!  I get up I take a shower I get dressed etc., etc., and I almost fall asleep driving the short 12 miles to work. I almost fall asleep at my computer during the day, I fall asleep during the news in the evening and sometimes I can't even remember what I've watched on TV.  My life is a total crap bowl, I'm depressed, I'm overweight, I'm not the brightest crayon in the box and there is a good possibility that I am about to lose my job....  I miss my husband more than anyone could ever imagine.