dxm is all about doses, if you 2 guys split a zicam thats only like 250mg each which isnt much. even if u did it all yourself 500mg or so isnt much. dont expect any open eye visuals like acid, you get closed eye visuals or for best results just chill in a dark room when your peaking.
heres my dose's-
250mg- slight drunk/high feeling
500mg- a little more confused state, creative thinking comes
700mg.- dissacociation of mind from body, closed eye visuals, random asociations occur.
1200mg.-complete out of body experience, lots of random images appear in head, general view of world changes, more intense cev's.

just chug a 8 ounce bottle of robitussin maximum strength cough, only dxm in it, that has 708mg in it. deal with the nausae, itll go away, and youll be tripping good.