Poor you, it's a horrible place to be where you are now. You're right though, this is the best place to get real, useful, relevant information and advice (and just share experience). Random internet = Bad.
My ds was dx at 3.5 with ASD, at the high functioning end.
At 2 he had language but was nothing like conversational. He only started to use the word 'yes' at this age. Had some echolalia. Trouble with pronouns (you/me), and he used "what" or "where" but never "when" or "why".
His playing was impaired, he had no imaginative play, much preferred cause & effect toys (eg ones that light up, press buttons etc).
Liked repetitive play, spinning plates round, pouring soil/sand. Threw toys rather than played with them.
Copied others but never showed much iniative of his own esp. with play & language.
Very poor social understanding.
Others said things like "he does his own thing doesn't he". Just generally harder to engage than other children, and didn't do the normal sharing things with me that other children did.
Liked familiar things, toys etc. eg would build the same tower with the same colour bricks each time.
Limited diet.
Little interest in engaging with unfamiliar people, especially other children at nursery. Played alongside but never with them.
Controlling of everything.
He's now almost 5, and after 18 months of ABA is unrecognisable, to the extent that he probably wouldn't get a diagnosis now. Very chatty. Bit obsessive still, and some anxiety (eg toilets). Interaction still a bit different, but not too bad. He's lovely, kind, sweet, and clever.
Like star said, the best thing you can do is start intensively working on interaction & communication.