Anyone knows of a mamga that changes one's mood which sucks a big time right now ??

If you signed in and posted with your "I am Reading", "I Have Read" and "I Want to Read" history, this would be easier to answer. We would have a sense of what sort of manga you like. You could try a tag search for "Comedy" or "slice of life", or go through lists posted up in the righthand corners of the manga you like. That might be a good place to start.