Sexually frustrated

So lately I've been begging my bf to spend time with me. From all the time to none at all and I understand it's his job. My boyfriend has been a Dr for seven years we've been together for three, but he's on call all the time. So last night I popped up at his job just acting like I was bringing him something to eat and well I was...hahaha...but then one of the nurses that was on call with him came knocking and kinda interrupted. He was just about to go down on me and mood just died like that! Anyway, today we try again in the car, very sixties. But I need that fix and the sex is amazing but for some reason we just can't get the time. So I'm in the car with him legit parked in the middle of nowhere and I tried stretching over to him and I pull a tendon! I don't know how or what to do anymore and I know he's trying best he can but i miss my baby :(