You should be able to sort this out at home, a&e know nothing about pumps at all, least of all about omnipods...
As priority give urself corrections by injections immediately.
Change everything with the omnipod.
Drink plenty of water. A glass every 45 mins.
Contact manufacturer helpline. Make notes of batch numbers etc to tell them..
You should not have odd high's like this. If on a pump, best thing if going above 12.0 is to change everything.... Unless you've had a chinese or curry or fish n chips... As these can throw you really high 5 hours later, and you need to learn how to give extended or multi wave bolus's for these foods.
After changing omnipod.. And levels coming down by manual injections you will need to look more indepth as to whether the omnipod is the cause and why... Or if you have an illness, or wrong foods etc..
Always assume if over 12.0 its the pump and go manual corrections and change cannulas, bateries etc.
Let us know how you get on....