While I suppose there's nothing to lose by having a couple more sessions--the next being W with MC--it's pretty much conventional wisdom that as long as there's a third person in the marriage, MC will be absolutely ineffective. SandS had a great perspective with the triangle analogy.
Either way, IC is very helpful for me and probably most people in this kind of sitch. It might be a big help for you as well.
M60 H52 D20 M14 yrs OW-old gf from 1986 bomb-5/18/08 H filed for D-9/10/08 D final 4/24/09 xH remarried (not OW) 2012