Most people dont realize how serious anxiety and other mental disorders can be, especially people who have never really felt the utter horror of a panic attack. In my opinion (and im no doctor or anything...) I'd say the best possible thing you can do to deal with this feeling of not having support is to talk with your family. DONT talk to them about how they havent been supporting you, talk to them about what your feeling, clue them in to your situation so they can empathize with you a bit. I've been dealing with extreme anxiety for quite a few years now, and I can say with complete confidence that I didnt even start REALLY getting better until I broke the social barrier and started telling my family everything.
You might have already done this, and if so then your already way further ahead of where I was when I started out. It took me 2 years of diagnosing and explaining everything to myself to finally realize that I NEED other people to get better. Your family and friends and the love connection between is your greatest tool, dont let yourself ignore that.

I cant pretend that I've been through what your going through, or that I know what its like to be in your shoes, but i'm sure it must be really tough. Charles Lindon is a dude that wrote a book on curing anxiety, and he talked about how anxiety is like an endless cycle, you get symptoms that your afraid of, you go through hell as the symptoms last. Eventually the symptoms subside (because they are only a creation of your mind, and not real in any way) but we are afraid that anything we might do could bring those things back, and it's that fear that brings the symptoms back...

It took me a while to realize that all of it is it's own creation, so to speak. If I didnt feel anxiety, i'd never be afraid to feel anxiety. If I was never afraid of having anxiety, it would never come back. Again, I cant pretend I know what your going through, so this might or might not work, but try comprehending being normal, even for just a second. Ask yourself, "what would I be doing/thinking/feeling if I was completely normal again?"

Really think about what you come up with and try to realize that if you know what it's like to be "normal", then you can be normal. If you something about you is wrong, that means something in you also knows whats right. To me it seems like this is your problem when it comes to feeling uncared for. If you didnt have anxiety, would you really spend as much mental energy as you do thinking of how little support your getting? If you didnt care that you were uncared for and you were perfectly fine with being on your own, would you have such a huge amount of stress?

I feel a strong urge to put one more disclaimer in my post and say, once again, that i'm not a doctor, i'm not an omniscient presence that knows all, sees all. I'm only relaying my own lessons, that I learned going through my own mental trials. I could be as wrong as Obama for president, or I may well have hit the nail right on the head. Regardless, I hope you continue using this site, and find what you need to transcend.

And i hope I'm there, when you do transcend (^_^) So I can catch some of the light radiating from you. --treasure planet... kinda--