im 18 and for the past 9months i have had problems with coping with my emotions. i will switch from having great days where im always happy and cheerful to days where i feel like crying all the time and sometimes when im on my own i feel real down and depressed. i honestly dont know what to do because i feel like im making my boyfriends life hell because i always take it out on him. he knows what im like and he doesnt mind but i do because afterwards when i feel ok again i feel so guilty towards him.
i have had bad stuff happen to me in my past and i was also addicted to cocain and ecstacy for 1year. eventho im off the drugs for for nearly 2years could this be any reason for my weird moodswings????

please help