Low Blood levels??? Urgency??

You should contact your doc and find out what level was low and what (if anything should be done about it). I wouldn't just assume it's the remicade levels unless you recently had a test for that. It's a specialized test. Since your flaring, a number of levels could be abnormal. Oftentimes we have to keep following up until we get answers. Docs see hundreds/thousands of patients and can only focus on one at a time. You have only one (yourself). Don't be afraid to keep asking until you get an answer.

How long have you been on Remicade?