I don't ever expect people to 'be supportive'. I have found that just makes me constantly disappointed and left feeling let down. But I love it when they surprise me.
Whenever we get a diagnosis (lots of people on here have several) it is a very lonely and isolating time, but the only way to get to grips with it is to OWN it, and accept that getting on top of it is to become self reliant.
Easier said than done, eh?
And it can take months or years to get there. We have to learn, ask, test, make mistakes and go through ups and downs. But if you start out with the mindset that 'it is for me to deal with' then there is no disappointment if we don't get support, but a heck of a lot of delight when someone helps out of the goodness of their heart. I see this on the forum nearly every day.