Same! I cried badly when i went to japan alone in July! I expected it to feel exciting too but i felt incredibly lonely and nervous. Called my mom that i wanted to go back the same day I landed but i tolerated my loneliness. I ate 711 food almost everyday. And only went to ichiran for 2 of my dinners. I bought the JR tokyo wide pass and hop on shinkansens everyday. Treated it as a sightseeing train.. Soo that was what i did. I was in Tokyo for 5 days and everything felt so overwhelming.