Aw mommy, that's ptyalism and it's really tough, a few of us dealt with it during early pregnancy din, super nakakahina talaga when it's constant like that. Honestly, this one kailangan talaga i-run by your OB dahil it's been four weeks na and affecting how much you can drink and eat; they might suggest things like ginger, mints, or even mouthwash to help manage it, pero they need to check kung okay ka pa with your endometriosis history. Hang in there, maraming cases nito it improves after first trimester, though I know saying that doesn't help when you're drooling all day!