i dont like to have sex.

I have been with my husband for 23 years .but married 13 years .we have 6 kids .our last baby is 10 months old .ever since I gave birth to him I just don't want to have sex anymore . I get mad because all he talks about is sex .it hurts when I would have sex .I know I'm the bad person right now .but I don't want anymore babies .I'm on birth control and use condoms if and when we do have sex .but I still got pregnant with my son being on all that they won't tie my tubes.because of high blood pressure . he makes me feel like if I don't do it he is going to leave . does this been I'm bored with him ? I just need help .plz no rude comments .