Ds1 started doing a strange repetitive facial movement (sort of scrunching up his face/eyes with a really exaggerated blink - hard to explain really) when he was getting more and more anxious about going back to school as the end of the summer holidays.
It got worse just after he started back, but then as he's realised that things are much better for him at school this year it diminished, in fact all but disappeared.
He developed a sort of short 'hum' that he does repetitively whilst doing something like reading or watching tv, as well as a sort of throat clearing noise.
Over the past fortnight he has started doing this again and at the weekend I noticed it has really intensified. The facial scrunching in particular has been really bad. Although, oddly I noticed that he didn't do it once during the whole hour he was on his beloved Nintendo DSi.
Am I right in thinking this is a tic and if so, it is probably stress related?
His behaviour has also deteriorated over the past couple of weeks and he is overreacting angrily to almost everything/nothing, being truly vile (particularly to ds2 and I) and ending up in tears a lot of relatively minor stuff.
Thing is, I don't seem to be able to get to what the root of all this is.
Obviously there is the whole, run-up-to-christmas nonsense at school, but that's a lot less now that he is in junior school. He has also started having weekly EP sessions (which he is loving) and is doing the speed-up programme once a week (which he also likes) as well.
Other than that he has had a couple of nasty accidents at school in the last week. Which really upset him.
Not really sure what I'm asking here really. I guess I just want to know how to help him. I'm finding it really hard and have shed a few tears myself in private after noticing him twitching and humming away. 
I'm also worried that it might get a lot worse, as he has his WISC IV test coming up a the end of this week, hospital appointment the following week. Christmas, then his ASD Assessment appointment then a week later his Paed appointment regarding his digestion and absences.
On another point, I did his pre-assessment communication questionnaire today and that had me in tears as well. I suppose because to us he is just ds1 and we have got used to how he is and how best to handle him I never really stopped to think how 'different' he is. It was quite an eye opener to realise just how many communication difficulites he has. I think because he is very verbal, it can sort of mask a lot of his problems. 