Yes to all of the above as well, including the rash thing. I had crohn's for 4 years before it ever showed up, but now the rash appears here and there when I'm flaring. Mine looks kinda like hives, but lingers kinda like razorburn.
Are you actually experiencing all of these symptoms, or are you just curious? Crohn's can really do a number on your absorbption, and not absorbing enough vitamins and minerals is often the cause of a multitude of our symptoms - including most of what you listed. Have you had any bloodwork done recently that might help you puzzle some of this out? For example, if you're having trouble concentrating you might be low on B vitamins I think it is.
27f, dx'd CD July '05 after 6 fistula/abscess surgeries
Remicade '05 through '08, with no other maintenance meds
'cade stopped working in '08 and I've been scrambling ever since.
Noticing a real difference with a Gluten-Free diet.
Probiotics, Digestive Enzymes, and Prednisone
Soon to Start:
Cimzia, acacia fiber supplement, and L-Glutamine