Lookslikerain - don't worry, you've hit the nail on the head! All of these changes are enormous, incredibly positive improvements and you should be feeling really proud BUT they creep up on you and because you are so close to it all, you sort of don't notice it happening! As you say, as soon as you write it all down it seems like loads
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I think we all have wobble days - it's in our nature to keep thinking things over. I keep writing all our stuff down as it really motivates me, especially on bad days or when family have been questioning it. It helps push me forward. I know that back in Oct/early November, before we started, I would have given my eye teeth for some of these improvements plus the hope it gives you that things can improve and get better.
Not sure how old your DS is, but your list has lots of similarities with ours. Things like imaginative play is a huge achievement - my ds is doing really well with this now - he wasn't interested before TH, but it started quite slowly with some copying and now he is off in his own way and making up stories for us to play and telling white lies.
Looking back at the original list we went to TH with, lots of the behaviours have changed, but I don't notice them until I look back - for example, he doesn't walk on tiptoe any more, rarely flaps, is no longer afraid of new experiences (bouncy castle, trains, buses, people, new foods) or loud noises. He doesn't tantrum as much and when he does they are much milder and shorter. It's easier to reason with him. With DD it has been different, but its as if she has come out of her dreamy state and started communicating with the world more - started talking a few weeks after starting her exercises. We can't understand much of what she says, but its there and coming on leaps and bounds.
Please don't feel funny about doubting but I would write it all down and keep looking back at your check list!
Good luck with your Robin appointment too.