I'm in the same process as you, it's so complicated
I'd say there's different levels of help available. First there's the 'emergency' help, if you're actively contemplating suicide. For that, you can either call 911 and have an ambulance come to your home, though police might come as well. They'll most likely decide to take you to an hospital. The other way is to directly commit yourself to an hospital, by going to the ER and saying you want to commit suicide. Keep in mind though that hospitals consider suicide in a clinical matter, and since psychiatric consults represent about 50% of all visits in ERs, the psychiatric unit might be full and you'll only be given meds and sent back home. I'd say hospitals are only good for crisis states, not actually recovering from your mental illness. If you do need to go to an hospital, try going to one that specializes in mental health, like the Douglas institute.
Then there's the 'support' help, like hotlines or support groups. They don't solve much either but can keep you going. The province-wide hotline is 1-866-APPELLE, but there's also regional hotlines available like suicide action montreal for example. For support groups, call your local CLSC. They often organise them. Also check out Revivre.org, it's a mental health organization, they offer virtual support groups for different mental disorders.
Then there's the actual help, much harder to access. To get meds, see your family doctor, who'll also refer you to a psychologist/psychiatrist. If you don't have one, get to the ER. The hard part at that point is waiting, since most public psychiatrists have an at least 6 months waiting list. To see a psychologist, you get 6 free consults with the Régime d'assurance maladie irrc, but there's also long waiting times. Are you still at school? There's often a psychologist or other professionals available to see for free. See if colleges or universities don't offer free or lowered costs consults. I don't see much else, honestly. If it can reassure you however, the PM announced more mental health resources, especially since what happened Saturday night. Might be some time before we get to access that though.
Anyway, I wish you the best. I know personally how tough it is to navigate through Qc's medical system.