oh boy i went through almost the same thing with my 16 yo daughter just 2months ago.first time upper and lower. but my dr had her start her prep 2 days before,only light foods nothing red,all liquid soups,then 2 days before 5 dulcolax laxatives,then the next day 5 more,then she said an enema 3 hours before procedure but she wasnt having that. yes she complained for 2 days not being able to eat. i was so worried she was not going to be clean enough,but she was even after sneaking some crackers after midnight the night before,then the day of the procedure was even worse than the prep,i told her not to pee before we go since they will do a pregnancy test,well she pee's anyway,they had to give her i.v liquids to make her pee,then they told her she may have to take out her nose ring,she just got it,so she was like nope not taking it out might as well cancel then.. luckily the dr said it was ok to leave in.. this was her first time being knocked out and boy she did not do well,she was sick for 2 days after,she says she's never doing it again,little does she know she has to. you really should call the dr and see if maybe the dulcolax prep would be ok,do not put it off.