A littlebit of backstory:
Ds1is13, super advanced academically (yeah yeah I know but it's true!!) , emotionally has always seemed a bit 'troubled' iykwim, eldest in his yr at school but friendly with those in yr above. He was dx with aspergers at age 6 but he is vERY high functioning. Came out as being gay in the summer, he seems totally fine with this. We have been mega supportive , we have always 'known' and he seems very confident about it. He goes to youth group once a week specifically for lgbt teens. They all tell me howself assured and confident he is. All good
BUT
I have discovered he is biting himself. On his arms. Badly. Huge red marks
I spottedthem and asked him and he told me. They're where his Tshirt would cover so don't think its for Attention 
plus the thing that worries methe most is he is restricting his food to thepoint whereyesterdqy he Ate banana and a cracker all day. If I cookhim a fave meal he will eat it. Over summer I discovered a whole drawer dedicated to sweets and fizzy pop in his bedroom. On fb I noticed that hehad written as one of his resolutions was to 'eat less'
He is properly skinny, his collarbones stick out, his once tight 26" wAist super skinny jeansRe hanging off him. Nothing pleases himmmore than being told he's skinny/lost weight.
Oh god writing this down it's glaringly obvious he's got a problem isn't it??
WTF do I do now? Why are my kids so complex?????