I have a bad stomach bug . Vomiting , diarrhea , horrible stomach pain. Feeling lethargic , and fuzzy. My question is : 4 days ago I hit my head really hard . Went to a local Urgent Care , they did a Cat scan (normal) and checked me over pretty good . Cleaned up most of the blood , stapled my head wound . Gave me a tetanus Shot and a pain shot. ................. I started getting my stomach problems around the same time , could the two issues be related ?