What causes itchy mouth roof, itchy face, itchy nose, itchy eyes and itchy body also itchy lips all at once? And also mouth ulcer on upper & lower lip

Itchy mouth. This is impossible to diagnose accurately without a clinical exam and thorough medical history. It sounds like you have either a viral infection, or an allergic reaction to something ingested or touched to your face. Viral infection usually heals in 7-10 days. To be certain, see your medical doctor for an examination. If it is an allergy, it is very important to learn what you are allergic to.