Never been there myself, but have dealt with patients with them.
Sudden flank pain's pretty much always a bad sign.
If it was a calcium oxalate-based stone (more than likely), drink more water and natural citrus juices (lemon/lime/OJ that have not been fortified with calcium), less soda and other poop with processed sugar and salt. If it was a struvite (bacterially-caused) stone and you're uncut, you may need to work on your hygiene.