I second Arsenic, you need to get a referral to CAMH. We were seen within weeks when DS2 started self-harming.
I attended a Statementing meeting with PPS/LA yesterday. About the only decent piece of advice to come out of the meeting was:
Note every piece of information relevant to why your child is not currently having their needs met, for example
What factors are contributing to him struggling educationally/socially?
What issues have had an impact on his behaviour?
What is causing/contributing to the suicidal behaviour?
What could/would help alleviate them?
If these negative behaviour patterns are 'new' what's caused them?
Are they due to his inability to cope with m/s? Why? What could help him cope?
Are his needs not being met by his school? How could they support him? What could be put in place to reduce the negativity?
Bullying? Where, when, how long has it been going on for. One or two children, widespread, role of bystanders, school response.
Don't focus on things he is doing well in, focus on the negatives.
All your reports from professional need to be within last 6-12 months, reports from years ago are ignored aren't given the weight of more recent ones.
Sorry if the above sounds a little bit blunt, but to be successful you have to go all out to prove your sons needs are not being met, and from what you say they are not.