I'd suggest calling your local women's shelter and speaking with an advocate. You are the victim of abuse, which is a totally separate issue from the drinking, even if it gets worse when he drinks. I've worked professionally in the domestic violence field for many years, and suicide threats are indicative of serious danger to you. Maybe he hasn't "hit" you yet, but I've known suicide/homicides to happen even when there was no serious physical violence before.
Here's an assessment you can take to see how much danger you might be in:
https://www.mosaicmethod.com. It isn't foolproof, and it isn't a substitute for working with an advocate, but it's still a fairly widely accepted threat assessment tool. Another good resource is the book, Why Does He DO That? Inside the Minds of Angry and Controlling Men, by Lundy Bancroft.
Glad you found us here.