I also had the exact same experience, johnnycomelurky (congrats on the baby BTW!) Emergency forceps delivery and episiotomy, 4 days later my stitches broke down and I went to A&E as there was a lot of blood loss. When I was told they couldn't restitch, it was the blackest moment of my life. I honestly didn't think I could cope being sent home with an open wound and dealing with a new baby.
10 weeks later I have been on 3 courses of antibiotics despite my best efforts to keep the area as clean as possible, and I think it's very very common for open episiotomies to get infected no matter how hygienic you are. However I don't think I was airing myself as much as I could have, so my advice is to go to bed knickerless every night!!
When I was told the wound could take months to heal, it was very depressing indeed, but the time does pass quickly. You're so busy looking after the baby that before you know it, everything is feeling better. I promise you'll get through it.
I couldn't look at the wound with a mirror until 9 weeks later, by which stage it was 80% healed. I'm glad I didn't look when it was totally open and infected, though I did think that advice about keeping an eye on it to monitor any redness/swelling was a very good tip. You've got to be brave though!
Now onto the next hurdle - having sex! Doesn't bear thinking about!!!