i think the dose you're thinking 'should' be managable, pink muse.
i think the best setting for dxm, especially starting out, is in your room, somewhat dim lighting, and your favorite music flowing. i usually have a notebook or word editor so i can write and think, although this is something i do frequently anyway.
once you defeat the nauseau, other activities can be beneficial.
anyways, i'm in no way reccomending you try again, but these are tips that have proved very beneficial to me. it's possible you may just get trapped in a personal hell all over again. it's possible that that's the only thing DXM holds for you.
well... peace!