maybe someone else can answer this, but i dont know if the rowasa goes as far as the left side, i think you need orals for that.
I completely understand about not wanting to do the enemas when you are feeling well, especially since you are only 20! However, you need some sort of maintenence drug. I remember reading about an alternative supplemt that some people were taking that worked like asacol. i think it was boswellia or bee propolis, ??? i'm not sure, but that might be worth looking into.
if you start getting lazy and forget to do the rowasa, at the first hint of trouble i would get back on them nightly.
also, adding a probiotic may be a good idea too!