Did any of the things you mentioned occur BEFORE the Remicade? I was just recently diagnosed with Crohn's (August, 2013) and just started on Remicade 3 weeks ago. Some of the things you mentioned I have noticed before the treatments started.
Remembering seems to have gotten worse in the past year or so.
My hearing seems like TV,radio etc.... has to be higher volume, even though I had my hearing tested and they say it is perfect for someone in my age group.
Hair loss actually started for me in my late teens, diagnosed with Alopecia, and had hair loss on entire body. Since starting different treatments for the Crohn's, my hair has been growing back. YAY !!!
Hope this helps you.
Rob.