spark troubles

I'm 19 years old, my boyfriend of almost 2 years and I just went back to our seperate colleges, neither of us have cars so we will only be able to see each other 2 weekends a semester besides holidays. Our first year before going off to college we had LOTS of sex. Sometimes it was a few times a day at least 3 times a week. I am on the pill and it is a 3 month plan so I only bleed 4 times a year. But in the past year, I've had difficulty staying in the mood or even moist enough to have comfortable sex. I've talked to my mom about the issue and said that she too would have issues with her sex drive while on the pill. I get very bad periods and find the 3 month plan to be a pain saver, but I also wish I could be more openly intimate with my man.