I am glad that things worked out for you. I don't think you need to fast, but you may want to continue to drink lots of water(or soup or fruit juice such as pineapple) and eat high fibre foods(bran if you are not allergic to wheat, oatmeal, apples, prunes, figs, apricots, etc.,) to completely clear the plumbing before your next flush. If you decide to fast for another day, just be sure to drink lots of water, juice, and soup to soften the stools and help clear waste. Don't rush into another flush, wait 3-4 weeks.
As for Sitz Baths, yes you can take them after a flush. To enhance the effects of Sitz baths, throw in a couple of cups of Epsom Salts . Sitz Baths really helped me in getting rid of a bad thrombosed hemrroid that I developed after by 5th flush.