I've been walking around w/tears in my eyes for a while now. I'm 11 weeks away & I actually started to break out in hives! (no kidding!) It was either my health or changing the way I was doing things. So this is what I did:
SET BOUNDARIES. I kept trying to make everyone happy and was ending up miserable. Now, I don't try to offend but I'm honest w/myself and my limitations. If I can't do it, I can't do it. Communication is KEY!
1 - Have your fiance interface w/his family. The burden of this should not be yours alone. They'll handle any bad news or disappointments better from him anyway. Its worked wonders for me.