My first two were hospital births, but I do remeber freaking out at transitions with my first. With my second I remeber freaking out but then saying to myself...this is normal, I'm okay, the pain is temproary.....my third birth went so fast the only thing I was freaking out about was weather or not the midwifes would get set up in time.
Your husband can be a great support for that transition period. Now that he has been through it, and can understand how intense that trasition can be, he can coach you through it.
This being your second, I'm thinking that your just going to be so much more prepared mentally. You can mentally prepare yourself all you want with the first one, but you really don't understand what you will go thorugh till your in the midst of it. You have that experiance now. So you do understand, and you do know. Your going to do great!