Cause of depression/no motivation

If anyone has any advice or knows the causes of my symptoms, I would greatly appreciate hearing some suggestions!
I am 32, but have always felt down and hopeless for as long as I can remember. I never have had as much energy as other people, even back in high school. If a normal life downfall happens, such as a breakup, I take it much worse than most people, and it takes me much longer to get over it. I barely have any motivation to work harder, go to school, find better jobs, etc. I have to really push myself, and a normal 40 hour work week to me seems like a 60 hour week to others. I am exhausted and can't do much else. I feel like so much living is being wasted because I barely "feel like" doing anything, and have very few days where I feel normal all day.

I know my diet has something to do with it. I don't eat fruits and veggies. I eat mostly sandwiches, eggs, toast, cheeses, etc. I find it REALLY hard to eat healthy since my emotions are messed up and I am always looking for comfort foods like pasta and pancakes.
I have had constipation since about age 24 and have been taking herbs for it. I get gas and bloating, and usually feel like taking a nap every afternoon. I have Acne and dark circles, and generally look and feel tired all the time even though I sleep 8 or more hours. I know I need to cleanse and maybe take some oils for the depression, but what should I start with? I have started Colon Cleanses before, but had trouble staying on them, and felt little results. What should I do?? Help!
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