Getting nauseous or hungry hasn’t been my norm in 27 years with a J pouch. It’s not something connected to your J Pouch, IMHO. It’s likely something else.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .