When I Get Upset About Something Or Something Happens And

When I get upset about something or something happens and its not in my favor in conection to people or my sorending, I go into 'the thought shower' like in a loop. And I think about a same subject for days and even a weak or so!. They are not positive and they case me a depression. So far the Doctor's Medical prescription on my "psychological problem" was taking Floxetin, Nortriptyline, Olanzapine, and clonazepam. I have been taking this medication with continuous therapy for more than 4 years. But, so far non of them were helpful. What is your suggestion.