I can only tell you that i researched jumping years ago (Please DON'T jump or fall anywhere... i read it break bones, paralyzes people, only works about 1/4 of the time to actually kill oneself, is terrifying according to survivors, and typically ruins their lives permanently)...
I've considered the alcohol method myself... i just know that i shouldn't eat 24 hours before partly so i don't have poop along with puke everywhere... Gross AND your idea of the forest is actually smart but for me... I'd be freaked out by millions of bugs, mountain lions, etc especially with no tent. Personally for me, i would still prefer a private bathtub by candlelight on the counters in safe glass jars playing ABBA in the background. Maybe that's too eccentric.
But whatever a person might do theoretically, please NEVER jump, never, never, never.
I'm just so sad that you're suffering physically with a chronic illness like that, please be careful not to crash, that would just make everything worse for you. Okay maybe i'm paranoid but i know i have my moments where it actually helps for people to remind me 'now remember not to .... x,y,z" etc. The forest has wild animals that could interrupt you? At least take pepper spray to fight off a mountain lion please? Then again ctb by mountain lion might be a way for some, although experiencing my limbs being ripped off while i'm still alive is still technically worse than my current reality, what about you?
Idk
May i please ask what exactly did you drink? I'm wondering if part of it was your kidneys/liver reaction? Or why do you think it was so painful for you?
Sorry you went through that...
My limited experiences OD'ing with alcohol were with Everclear and Vodka... everclear was actually more pleasant for me as far as hangover... it felt like i had the flu but vodka made me feel like i got hit by a train... and no, a train didn't work either as someone showed up saying "God sent him" (eyes rolling) that sabotaged my ctb attempt (again).