I'm sorry to hear that Danni. As I think Dimples said, don't apologise ever for posting. Its good to offload and to get hopeful support from others.
I don't know anything about his meds, but he's had some good days hasn't he? Is it possibly that this just isn't the right level of meds for him? Its good your next appointment is so soon, I'd really be pushing for some thoughts from them - do they think its not the right level, or possibly not the right drug? I have said this before but I know from talking to DS's epilepsy drs over the years that some epilepsy drugs can make things worse, crazy behaviours, depression, or just not control fits. Others still under the umbrella of anti seizure drugs work totally differently and have different results. The brain is so complex and they (the Drs) should understand what's happening (or not happening) and why.
I think there is an inclination (with epilepsy meds too) to start as low as possible and on the drug that is as cheap as possible. And that's sometimes OK - epilim works for DS on low dose. But its not always the answer and I've read stories of loads of parents of kids with epilepsy who have had to try 3, 4, 5 different ones before they get the "right" one.
I'm sorry if this is a stupid thing to say and I admit I'm probably completely off course here (I've put my foot it in with Open before on this subject!) but as he is so verbal can you not extract any information from him as to what is wrong/why he is behaving like this suddenly? I admit because my own DS is non verbal and I spend my life trying to work out what the fuck is wrong that in my head I assume if I could ask he could tell. Very possibly not. But can you get anything from him that may give you any thoughts? If not ignore this paragraph.
Open, thanks so much for your thoughts on play. I don't think the issue for DS would be so much that he knows or doesn't know the children, its finding that "activity" that you mention that keeps him engaged and then getting the shared joint attention. I remember SALTS trying to engage him with some toy or whatever and him not playing ball and them saying if he won't engage with an adult who is trying REALLY hard, he isn't going to engage with a child.
Weirdly, he is sociable but NOT when an activity, specifically, is involved (of his choice) - so he will find me out, want to give me a hug, sit with me, take my hand, smile and me when out and about and so on - he's actually at his best when doing nothing other than accompanying me out and about (minus the café/falling over incident business at the weekend). But if you take an activity that he engages with (lets say playdough, or playing in a sand pit, or wading into the sea) his 200% attention is on that. Whether someone is with him, adult,, child, whoever and even if they are really trying to join him in that activity ("DS" Lets splash in the water" Lets mess up the sand!) his eyes and attention are purely on the thing he is wanting to do. Sometimes I think I could actually walk off and leave him in a random sandpit and he wouldn't even notice I've gone! This is where I'm at pains to see how I can get him to play in an activity that he wants to do WITH, say, DD - its like the joint attention is just not there. Anyone else's child like that?!