That nervous feeling...

Lately I've been getting the nervous feeling in my stomach a lot, like something bad is going to happen or like I don't know, something in my relationship. I find myself constantly nervous that my bf of 2yrs is not so much cheating physically on me but that he may be in the market or just bored with me. When he and I first got together I will admit our relationship was very steamy , over the course of the 2 years I would say we're down to maybe once twice during the week, probably because of a lot factors, he works overnights , so we only have a couple of hours in between from the time I get home to the time he leaves and although I don't have an issue with quickies I don't want quickies all the time every time, we had this conversation a month ago and we started to make changes , in a positive way and spending more time with foreplay and not just rushing it , then I got sick and my period and we hit a brick wall again , I don't know I think I'm overreacting but I don't know I just have this feeling that he isn't happy anymore! I love him and want it to work with every bone in my body but I just can't be the sex that he wants every day of the week! I desire more than the wham bam I'm out the door, see you in the morning . I don't know what to do or say anymore, I just needed to vent maybe...