When you get an email telling you that you have a new comment on your blog, you can click reply and if the person shows their email address then you can reply right back to them. If they don't show their email address then they get no replies :D
I can't help you cause I don't use Blogger and therefor don't know how it works, but if all else fails you could just post an original comment on your own posts and address them to the commentor. Sorry you had a rough day! May tomorrow be 1000 times better!