Sudden nosebleed help

Hi,
Got to Japan yesterday, after a long day until I could check in I noticed I got a sudden nosebleed when in the public toilet. Fortunately I could put up some tissues and wait but its a bit awkward if would happen in a busy station, people waiting.

At home I could buy some blood stopping tissue but not sure if I can find it here.

I lost my tube of sesame oil spray somewhere, but for more sudden occurances. Where can I find such tissue in Japan? Convenience stores?

It would be a problem if occuring in Tokyo rush hour for instance... I am really worried.

Nosebleed often occures when you see a large number of crowd, it's a kind of temporary motion sickness. You will eventually get to used to it.
No Japanese people use nose spray for stopping nose bleed.