None of My Comments Have Shown Up for a Couple Days!!!

• Has anybody ever had this happen to them? None of my comments are showing up on my posts!
• They come into my email, and then I go to my post, and the comment isn't there on all of my blogs!
• I haven't messed with the settings at all.
• I've tried leaving a comment on my own blog, and it will show up when I've made it. Then I come refresh my browser, and nothing is there.
• Please let me know if you've experienced this before.