You are likely to need a prescription but your gp should be able to send (it was fax when I needed it but it may be email now) to a named pharmacy.
But with words like “likely to need” and “should be able to”, if it was me, I would take a deep breath and drive home to be sure ... just like I did when I got to Heathrow on a business trip and realised I had forgotten my passport. At least you won’t have to change your flight.
I had to drive home and back to my parents (70 miles each way) on Boxing Day once when I realised I had only taken enough basal for one dose. I got up early and was back to see everyone else eat their breakfast.
Not that I make a habit of forgetting things