Nausea and feeling of diarrhea (but it didn' thappen). Period due soon. Itchy red rash/redness around anus with slight bleeding. Help?

Pruritis. The nausea may be related to the time around your period but if you have had a change in your bowel frequency leading to more movements and especially more cleaning and wiping, the rash and bleeding may simply be due to prurits ani and the trauma related. Try using some over the counter ointment like desitin (zinc oxide diaper cream) or a&d and wipe with baby wipes, no perfume, etc... If the change persists, see someone.