I have had a lot of post-acceptance stresses. I got three rejections (two implicit) after getting three acceptances which killed some of my confidence a bit. But mostly I'm just so thrilled I got in anywhere after thinking I'd be rejected everywhere. The phone conversations with professors are the worst, though. I have social anxiety issues that are particularly exacerbated over the phone so it's always a struggle. I think I've gotten most of them out of the way, though, and they've gone pretty well.
And visiting weekends! I have my first one coming up next week and I get nauseous every time I think about it. I'm so terrified of messing up somehow and having my acceptance revoked, even though I'm pretty sure that could never happen.
There is also some anxiety about the decision I'll ultimately have to make, but I figure I'll wait until I see the schools and speak more personally with faculty and grad students before thinking about that too much.
Sskdjfnkeysmash.