I'm confused, didn't you say that since you lost weight the diabetes is in check? So how would that make you sick? Are you sure the things you listed are what's causing your anxiety, or do you just feel general anxiety and aren't entirely sure the cause?
Ok, well here comes a dose of armchair psychology: I doubt the things you listed are what's causing your issues. To me you've got what appears to be a pretty heavy amount of anxiety over the notion of losing control of yourself or your environment: drug use, eating disorders, agoraphobia, each one of those things just alone would suggest to me that a person feels out of control, ESPECIALLY the eating disorders, but taken together that's a pretty god damn strong indicator.
And a lot of times the feeling of lack of control is a fairly subconscious one, but I know it well because that tended to be why I was fairly agoraphobic and liked getting fucked up so much when I was younger: when I was in my house I was in my own territory; nothing bad would happen, there would be nothing to stress me out, nothing unexpected would occur, I could completely control my environment. Similarly, drugs allow you to control you mood, but even more so they're just something you can control; no one can tell you how much you can take or what you can do with them, it's all about you and what you want (although instead of just quitting weed due to the anxiety it caused me, I just eventually found opiates. If I was smoking weed every day despite not enjoying it much, it goes without saying that finding something I REALLY enjoyed didn't turn out well). The same goes for why eating disorders tend to develop, especially among young females with a strict, high pressure home life with very high expectations; eating is one avenue where people can usually control, in general nobody can tell you what you can eat or how to eat or when. Of course obviously there's a reason it tends to be more common among females, because body image also tends to help push them in that direction, but it's still ultimately about control.
Now, what to do about it? Well, dealing with it isn't exactly simple and there's no way that will work equally well for two people, but I guess I can at least say that for me the entire agoraphobia issue A) got a bit better with age (I'm only a year older than you, but for me it started earlier too), and B) got better through cultivating self-esteem, recognizing that I'm a pretty awesome fellow who's capable of dealing with whatever in a suave fashion, and if anyone looks down on me it's them who's in the wrong, not me.
I know a lot of my problem was that whenever I went into public I felt out of place, like everyone else knew something I didn't or was somehow just more capable or "normal" than me and just all somehow magically felt at ease, and what really helped me was realizing that no, people AREN'T that at ease. Lots of people are complete balls of nerves and many people are absolutely terrified of looking stupid in public. Many of them are looking at you the same way you see them now. It's kind of like when talking about snakes or something; remember that a lot of the time they're more scared of you than you are of them. And if they aren't, it doesn't matter. Confidence feeds into itself. If you're confident people will respond better to you which helps you be more confident and so on.
Now of course the problem with the above is that all that did for me was make me no longer afraid of losing control in public, it didn't remove the anxiety I feel over not being in control of myself in general. Unfortunately I don't have much advice there; right now I'm living an ok life but just can't seem to give up the drugs not because I like getting high that much anymore or feel like I need to to get by, but simply because drugs are one of the few avenues I have in life where I feel like I'm truly doing something by myself, for myself, and am completely in control, but even just getting yourself out of the house is a big step in the right direction. You're never going to figure anything out if you're spending all your waking hours cooped up in your house afraid of the outside world.
So that's my 2 cents. Still I doubt anything anyone says here can do much, I think you probably just need to see a doctor who can work with you face to face. It's not that lots of folk around here aren't rather sharp, I'd trust a number of them over some of the therapists I've seen in my life, it's just that it's hard enough figuring stuff like this out when you're in person let alone online with only a brief description to guide you. Regardless though, hopefully you figure this all out no matter how you go about it. Good luck.