One way to feel better is to try and concentrate more on what is good and going right. But since you have such depressed feelings that seem destructive, too, you probably should seek the help of a medical doctor and tell them exactly how you feel so bad at times. Pulling out of depression and the other symptoms can be done by many different ways. Try to divert yourself when you feel real down. Go out to a movie or rent one to get your mind off of the sadness. Do what makes you feel good and force yourself to make yourself feel better. Just keep practiciing pulling yourself out of the rut and it will take hold. It's something you must keep doing. Sometimes people need medication, too. You might want to try that route in addition.

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"Man's mind stretched to a new idea
never goes back to its original dimensions."
Oliver Wendell Holmes