Imo, 111 just google it anyway. Have never found them any help. Just keep an eye on it and see how you go, puss. Hopefully it's calming down. If it,starts and you feel dizzy, breathless or can't stop it after 20 mins, get some help.
To explain my post to sqad - we had a resident with nosebleed admitted to hospital a few years ago. They said the only reason they were worried was that the blood was dark- so coming from further down than just nose trauma. It turned out to be coming from her stomach. But that is a different case to yours, puss, and i don't want to panic you unnecessarily.