My GI says anything that happens weeks, if not months, from the infusion is likely not related to the Remicade. I doubt your pains are Remi related since they occurred 2-3 months after an infusion. It may be another auto-immune-related thing, once you have one auto-immune problem like UC, others tend to rear their ugly heads.
Diagnosed UC April 27, 2006; mild arthritis in lower back, dx'd May 2008; Osteopenia dx'd 6/08
9 Remicade infusions: 7/21/07; 8/18/07; 10/13/07; 12/15/97; 1/26/08; 3/8/08; 4/19/08; 5/24/08; 7/5/08; 8/15/08; Current meds & supplements: Lialda, 4 tabs in the morning; Xanax as needed (rarely); Tylenol Arthritis Formula or Tramadol as needed for arthritis pain; multivitamin w/folate; Culturelle; Fish oil capsules, calcium chews and/or Tums; Vitamin D; Past meds: Prednisone 4/06-4/08; Entocourt EC; Rowesa; Asacol; Colazal; Venofer (iron) injections Dec '07; Imuran (extremely bad reaction 2/07); Protonix;Lexipro