Congrats on surviving 33 miles!

After pushing yourself on a killer ride, and ending up really sore and stiff, I recommend to you what I do myself:

1: give yourself a 24 to 48-hour moratorium on riding.
2: get some anti-inflammatories on board, i.e. Ibuprofin, Naprosyn
3: enjoy some long warm showers to sooth a sore body - beg your hubby/boyfriend/man servant for a massage if you can!
4: swollen parts get ice packs, if needed
5: water nourishing food and an extra hour of sleep can only help your body
6: gentle stretching

After a day or two, for your body to heal you'll probably be OK to start getting back into shorter rides and working back up to that 33 miles and beyond. Hurting yourself again and again could really take the newfound fun out of riding and that would be the biggest shame of all, don't you think?

Good luck!

P.S. I assume, with your back problems, that you have discussed your exercising and bicycling with your physician?