“Heroic” dose of DXM. Dangerous or no?

I weigh 185 lbs. I know, I’m a fatass

I’m planning on taking a “heroic” dose of DXM. I wanna take 1,200 mg of DXM, alongside 1,000 mg of DPH, and maybe smoke some weed depending on how I feel.

What would be the risks involved in this? I’d have a trip sitter just in case something goes wrong, but how physically safe is it to take this much DXM at once?