Congratulations on your success!
Saddle pain is according to some, inevitable. You're sitting a way that's unusual; you're using muscles you haven't used before. Discomfort is to be expected, I suppose.
I encourage you to take your bike to a local bike shop. Sit on it and let the folks help adjust your bike to the best fit possible. Ask about different saddles.
I know it's ridiculous, but I have a beach cruiser saddle on my mountain bike. I ride on roads, paths, sidewalks (not many mountains in IL) and the saddle is most comfortable, albeit _impossible_ for "real" mountainbike riding! I also ride an Alpina Univega with a traditional road-bike saddle. If I'm not careful to rotate the two bikes, when I use the Alpina, I face some real pain!
I sympathise with you. I hope you find the strength to get through it!
Good luck!