l know a pdoc is the only one who can diagnose, but l am starting to notice some real patterns in my moods and was just wondering?

Recently l have spent weeks feeling really down (the darker stuff), then a pounding headache / vomiting followed by a week of anxiety and overwhelm that l took diazepam for and for the last 2 days real excitement thinking l have my life sussed, don't need therapy and l am going to retire and live on a houseboat. It all seems so logical and the very best decision in my head, but something is making me wonder.