It's a hard thing to know that a lot of people with PTSD do struggle, a lot, every day. I'm not saying that to minimise what you're feeling at all - I know it can be hellish but if you're seeing an intensive programme, that you can't access, as your only chance of treatment you're going to become steadily worse.
There are loads of resources out there that can help you understand your condition better *and* help you heal. I highlight that because it's too easy to read, recognise yourself in the pages and get very despondent and a "my life is awful, it's says so right here, no one will help me - I'll never get better" way. The books you're reading are a good start.
As you're reading look for things that you can do that will relieve things even just a little bit - lots of little bits of grounding, mindfulness, self care etc can start to make a real difference day by day in terms of you functioning better and increasing your tolerance to therapeutic work. Talk to your therapist about your lack of social support resources and see if she has any ideas about what might help - and try not to dismiss her suggestions as too hard because of X.
You've came here which is a great start to building supports - really have a look around and learn as much as you can, there's a fantastic thread on top ten cognitive distortions that's a great starting place. Also read
@anthony's article explaining that reading and posting may increase your symptoms.
I'm not saying you don't need therapy or treatment but it might help to think about it like going out for dinner. Sometimes we get a beautiful meal served to us on white linen cloths, at others we get a very nice buffet that we help ourself to but is all provided in one place, at others we'll cobble together something from a food hall. We'd all love (and some may really need) the white linen experience but food hall food is still food.
Recovery is hard work, even with the best therapy in the world it places a lot of demands on people and sometimes it feels worse before it gets better. But it's possible and worth it.