It differs person to person...many people go through cycles. Some people with help basically overcome depression and go on to live a normal life maybe with a few recurrent episodes...other people deal with it their entire life. We can't diagnose you of course but what you've described isn't normal and as others have said, you should get professional help; you are much more likely to make progress with professional help rather than without it. I know it isn't easy for most people though! It can help to remember that doctors have heard it all, you won't be the first to ask for help for this kind of problem.
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