Forget about the oral sex. He's known for a while that you're not into it, so he made up his mind on that. With that said, however, it's never a bad idea to use the old rule "birthdays and holidays" for things like that. But don't let anyone talk you into doing stuff you don't like. It's not a fun experience if you hate it.
But I know how you feel. I'm in my mid twenties now, I've been with my fiance for almost 3 years and after the first 6 months, my sex drive completely dropped off. I'm pretty sure it was partly due to some health problems that are now being reversed thanks to correct medication. But it still hasn't gotten better. I have no explanation for my lack of sex drive. Being unemployed and helping him with his business over the last two months plus running the house all the time hasn't helped my anxiety (because I am very actively seeking money... I mean, work.) But anxiety/tiredness has NEVER affected my sex drive before.
He takes it personally, which makes me angry and makes me cry depending on the day. Even he, going on 30, can go at it several times a day, even after masturbating. I've never met anyone with his sex drive before. He definitely doesn't help. He's so starved that whenever he's home and in physical proximity, he makes comments about my looks or grabs my boobs or something. He's never been the best at foreplay because he's had some awful relationships in the past, but nothing is going to help if I can't get myself in the mood.
I've considered doing everything- exercise, stopping BC, seeing a counselor (but free ones are hard to come by), scheduling sex so that it trains me to get aroused, but I have been so busy that even thinking about solving the problem irritates me. And I have told him the things he does wrong, but he's not going to change any time soon.
I almost want to give up and we're not even married yet. I'm just hoping that life will fall into place soon and then I'll know for sure if it's stress related.
At least you know what's bugging you. You have a job and a family to think about. He should respect that, there's no excuse for people to wander in relationships unless they intend to end it.
I always tell people to try to change their diets and have an exercise routine, because the activity and certain foods can boost your libido.
Good luck with your endeavors.