Are curses real and do they exist?

Serious answers only please. i have this feeling of impending doom all the time, like something bad is about to happen constantly. im not paranoid or anything like that. im a born again christian and strongly believe i the Lord. but i have alot of really bad days. i try to stay positive, but its not enough. i pray alot but it doest help. any serious suggestions would help please. thank u.