The process also is reliant on your current body weight. Anyways, taking vitamins and trying to supplement might make it easier on you, but you're slightly prolonging your death. As time goes by your everyday movements and ability to think is gonna become 100x harder. If you do consume any food it's likely you'll trigger a binge because your body is so desperate, your body could take you to great lengths to get any sort of fuel in you. Idk it's easy to look up how hard it'll be.
Anyways the long lasting effects you can end up with is heart damage, liver damage, kidney damage, loss of bone or muscle tissue, osteoporosis, etc etc etc. You can also cause refeeding syndrome if you eat too quickly after long periods of starvation (and loss of electrolytes), which would suck if it doesn't kill you fast enough.
Having gone through an ED (though not to kill myself) it feels easy until it's not, and returning to 'normal' physically was just as painful and depressing. I had at least a month where I felt a bottomless pit in my stomach and ate everything in sight. My stomach was fucked up and I couldn't defecate so I literally looked pregnant, when I leaned forward it felt like all that was in me was gonna seep out my throat, and that's just the surface of ending starvation.
Idk I don't personally think it's worth it, I've also never seen anyone here encourage it. It's a long and painful process and it's likely one you'll end up backing out on as the days get worse or something comes up. It sounds easy, as does letting yourself freeze to death in the winter night, but it's really not that simple. (Also realize if you look up 'positive' experiences in starvation such as fasting, they're likely incredibly supplementing their self or doing it under medical supervision)