At the earliest opportunity LIKE TONIGHT you should go to a hospital walk-in centre and get them to check the wound// dressing etc. That visit will "log" your injury into an official system and the medical record can be retrieved (with your authority) should you make a personal injury claim.
You really should do that. It will help a LOT
Mill Lane, Wallasey, is open until 10pm and will likely be less busy that Arrow Park.
5 Precepts of Buddhism seem appropriate. Refrain from taking life. Refrain from taking that which is not given. Refrain from misconduct. Refrain from lying. Refrain from intoxicants which lead to loss of mindfulness