From a guy who has had a girlfriend with these issues....
He's probably thinking "man, there's NOTHING I can do for her about this."
And that's kind of the rub. I think guys tend to be willing to listen to problems and offer suggestions as long as it's something fixable, when they can provide advice that moves the issue forward. When it's not something they can actually help fix, they're at a loss for what to say or do after a certain point. They can listen, sure, but listening to the same problem/problems repeatedly with no end in sight does tend to wear down someone's empathy. They can offer insight and advice, sure. But when they end up giving the same advice over and over again and it doesn't make you feel any better....
Try this. Instead of approaching it as a "problem" you've got to share with him, approach it as "telling him about your day." Days are full of worries, tedium and frustration. He'll relate to that.
Not phrasing your issue to him as a "problem" sends the signal that you've got a handle on your issue and you're using him for exactly what he should be used for: someone to talk to and relate to. If you feel your anxiety/worry mounting and your "talking about my day" is turning into a rant.....just stop right there. Remind yourself that you're not looking for help, you're just looking to share your day's experience. He may sense you're not really letting it all out.....and then get REALLY interested in what your real problem is. Or maybe he'll go "Hrm, ok, I guess she's got things under control" and the relationship between the two of you can get back to a more balanced footing.
This isn't to say you shouldn't go to him when you have a real problem. But when everything is something you need to talk to him about to try and feel better...it can be hard for him to distinguish between big problems and little problems of your's.