First off, congrats on quitting! I did the patch method, and it worked for me... just really have to want to quit that nasty substance.
I looked briefly, and i can't find any peer-reviewed medical journals on the subject, aside from mentions that nicotine itself is an maoi, and is certainly potentiated by the combination.
I do have minor similar personal experience of smoking changa w/ a nicotine patch on, and I did get a really really nasty headache. It was enough to put me off smoking again until I was off the nicotine.
If you are already down to 7mg, maybe just give it a few days and drop to 0. I found the drop from 21 to 14 and 14 to 7 to be more noticeable than from 7 to 0. It feels great to be off too... I think even if there isn't a physical component for you, the concern about interactions may 'color' your trip, and the relief of being off of all nicotine if you wait to dose may also give yr trip a little positive boost for the accomplishment.
Hope that helps
“What goes on inside is just too fast and huge and all interconnected for words to do more than barely sketch the outlines of at most one tiny little part of it at any given instant.” - David Foster Wallace