Different people have different ways of processing sensory input. It's great that you are able to identify yours and find ways to meet them! It's actually common for children to have sensory needs that they "grow out of" when they get older- but some do stick, as well. Some people, like yourself, recognize that seeking the sensory stimulation they need helps them to focus better and feel grounded. This is a current area of research in occupational therapy, especially in the area of pediatrics. If you want more information, google "sensory diet" and read about
one of the theoretical approaches to sensory processing.
It makes sense that when your are getting the sensory input your body needs, you feel better physically in terms of Crohn's. It probably has less to do with the disease process and more to do with the general state of your body and brain (my personal theory, anyway.)
I've noticed some of the same things... when I'm feeling sick/tired/just unwell from Crohn's, I crave deep pressure. I also cannot tolerate noises well, I have a certain volume threshold and can't stand noisy situations.