Hi, Well as you have mentioned above, you are absolutely right. Your symptoms show that you have moderate to severe depression. Since its been going on for such a long time i would suggest that you get in touch with a psychiatrist first as medication is necessary. And secondly, you must take counseling as medicines can help heal only 50% meaning the physical symptoms. For a stable mental health which would your remaining 50% you need to take a fee sessions in counseling. Follow the suggestions religiously with regular follow ups with your doc and it will surely help you to recover.