Hi, I'd like to help you with your problem.
It sounds like from what you described that you have been seeing a psychiatrist and although that helps immediately after the session, it does not help in the long term. Also, you are taking medication but I'm not clear if it's working for you. The side effects appear bothersome as well. And you indicated that your doctor does not feel the medication is needed.
I was wondering if you might have considered other treatment options. Regular, individual therapy with a counselor who has experience in depression might be a better option. You sound very aware of your issues and what makes you feel better. Your insight would go a long way in helping you in regular therapy sessions. Once a week would work unless you feel you need to be seen more often. They would also be able to help you to work with your dreams and determine the origin of the dreams.
Also, support groups might help as well. There are two benefits to a group. One, is the sharing of symptoms, feelings and issues with others who are experiencing the same thing or close to it, and the chance to gain support and social contacts which helps depression suffers improve their moods. Groups tend to be a great way to feel less alone with your depression. You would also have better input from others on what medication works for depression.
Support is key here as well. Since you live alone, it is much easier for you to isolate and you must force yourself to make contact with the outside world. Try taking baby steps and get yourself out more often. Join a hobby group, meet a friend for coffee, browse a bookstore, anything to get yourself out and about. It is hard at first, but if you take it slow, you can do this.
I hope this has helped,