My last Major flare, which was back in the Autumn of 04 the accursed mouth ulcers were my first symptom, along with peri-anal issues. It turned into a pretty mean flare, too. The amount of them you are getting would have me at a doctor's office ASAP nowdays. One or two, I get every now & then. A whole swarm, I'd take as a warning!
Sorry,
Matthew