why don't i have a sexual desire?

[Lindz]

okay i am a 22 year old female and i have been with my boyfriend for 6 months i am VERY attracted to him and when we first started dating we would have sex all the time...i mean like a couple times a day everyday...for the past 2 months or so i've noticed that i get horny and but not as much as i used to and i cannot orgasm...now within the first couple months of us dating i was put on loestrin 24 fe...after about 2 months of being on it i started feeling weird when we were in bed...also i am on citalopram which is an antidepressent so i dont know if those 2 have a certain side effect...but it is definitly not my boyfriend im very attracted to him like i said and we have a great bond and chemistry...but this whole situation is making him wonder and making him think its him when its not...and i want to orgasm so bad but it just doesnt happen and now everytime we have sex that is all i think about and i think the pre-worry also has something to do with it....does anyone know what i should do? is there a better birth control out there? or am i just "sick of sex" ?? i hope theres nothing wrong with me...please help!!