I woke up this morning around 1:30 to use the bathroom and after returning to bed, became restless and had trouble falling back to sleep. I got up before 6 this morning to get ready for work and had a mild headache, so took my thyroid medicine, showered and then took 2 regular Tylenol. I noticed that my right arm was aching since I got up and also had pain and discomfort in my back between my shoulder blades. I have been experiencing this arm pain and back pain all day. I have since taken more Tylenol. I also have Ulcerative Colitis and am taking Asacol daily, Rowasa enema at night, a blood pressure medicine (forgot the name) usually take around noon. I m also taking Remicade infusions. I ve had 2 treatments so far...my next one being July 10th. I guess I m wondering if this is a side effect of the Remicade, which I don t see that it would be, or something else. How serious could this be?