A GP may not prescribe (though some on here have managed to get a GP to!!!) It's an unlicenced medicine- so generally you need a specialist to prescribe.
been thinking about what you said about this all suddenly happening NOW...and it reminded me of DS1. We had gone to parents evening in the october- he was 7 that december. His teacher reported all was fine. Then in the november, she called us in....she had decided to refer him for assesment regarding ASD!!!! Sure, up to then he'd been described as 'unique' active and bright....but suddenly she was telling us he had a 'Special Need' and he had to go on the schools register as such...and that School Action Plus was so they could get a peadiatrician to come into school and observe him. Within 3 months he had been noted to have Aspergers Traits...and i just felt like you descibed. Suddenly he changed.
Now, having had 2 more boys - 1 diagnosed with AS and the other being diagnosed currently....I have seen a pattern that is the ONLY thing identical in all 3 of my boys (as each of them showAS differently!).
This similarity being....how behaviours worsened around age 6!!!!!!!!
The paed said that it was to do with at that age (as they are about to go up to juniors) that children start to make lasting friendships,play complex games in playground,invite eachother to parties and talk about the latest popular toy or film/tv show/playstion game.
And thats where AS problems can worsen- as our kids often find peer friendships difficult- often prefering to take lead in games- and suddenly the games they repeatedly like to play are being replaced with newer ones...and they are often excluded because in their efforts to join in, they may be loud or rough they may struggle taking turns or being part of a team...or find imaginary play incomprehensable.
It's common that 'our' kids don't get invited to parties from around age 6/7- my ds3 is currently known as 'the one that distracts everyone' in his class...so he has had no invites since october. (you may notice at this time that the other mums don't seem to approch you so much in the playground...and if you are really lucky...they may even whisper 'about you and your child'...or discuss YOUR child's behaviour and how it affects THEIR child at school...but discuss it with the teacher and not with you. You only find out when the teacher calls you and tells you that a parent has expressed concern.
And then when your child is still passionate about pokemon...when all the others are into Dr Who....and noones interested in his amazing knowledge about his favourite hobby etc. And they are all talking about the latest episode of a tv show...and he hasn't a clue why they are even interested.
But...again...every now and then...HIS hobby/tv show WILL be POPULAR again...and he will suddenly 'appear' to fit in...until the next craze and he is left behind.
This has happened to all 3 of mine....and it was noticeable around 6-8yrs.
I hope something in this rambling hits a note with you and your son.
If it does, it may just help if i've provided an 'insight' into what may be going on around him. It may make you feel better to know why he may be reacting differently to what's going on around him...when to you nothing has changed.
finally, for me, at this time of year my boys are always at their worst- as school routine is altered to accomodate SATS, sports days etc. My ds2 has been driven crazy this week as he's had no maths/english formal lessons at all all week as they did a 'multi-subject' healthy eating / fitness week- which joy of joys ended with 2 non-uniform days...which he HATES...he prefers to wear uniform! now every other child is whooping for joy!!! No maths...no uniform!!!!
So maybe your son's school have 'rocked his boat' a little???
Well...i'll leave it there....its nearly 2am and DS2 will be awke in 4 hours...and ds3 in 5 hours....and then ds3 will provoke and wind up ds2 and ds3 will try to 'calm' the situation...and chaos will be rife in 6 hours!!!!
Oh! The fun of it!!!