An SSRI won't conflict with any of those, but I'm not familiar with SSRIs and side effects, how they affect your IBS etc.
Some have reported that their IBS symptoms were better when taking an anti-anxiety or anti-depressent medication. So in fact it may help.
As for the peppermint caps, I usually take them with dinner since I have more fat/IF at that meal. The teas are easy to take anytime though, as the caps have to be taken either on an empty stomach or with a meal.
Hopefully someone else can chime in here with advice on the meds you mention.