Welcome to the forum. You may already know this, but Remicade can cause drug induced lupus. I hope your doctors will do further testing to see if thats the case. Usually once your off that med the symptoms will go away. It is possible to have both diseases though. Read, research and ask alot of questions to your doctors.
Ask all the questions you want here as well. We will help you in anyway we can. I hope you get some answers and relief soon. Please keep us updated and take care.