Hi. I don't know about
the not tolerating oral but tolerating rectal meds but I can help you on the enema procedure.
I do the enema in the bathroom, stand up, quick rinse of hands and go lay down right away, on my left side...that's what I'm doing now actually. I wore pads at first because I was unsure but I don't anymore. If it makes you feel better, go for it. As far as in the morning, when I'm flaring it is a bit more explosive but in remission the enema just becomes part of my BM.
Best of luck.