While I'm one of the fortunate ones that never had to experience waiting, what you are feeling is completely normal.

Things to help pass the time:
drink margaritas!
look up the public transport in the area you are moving to and start to learn the routes and timetables
eat queso!
Start taking practice theory tests for your UK drivers license
drink margaritas!
Look at what you'll need to do to get your National Insurance number once you move over
eat queso!
Translate your resume into a CV format
drink margaritas!
Look at your flip flops and mourn the loss of their use (this summer being an exception)
eat queso!
Look at the NHS website for reviews on doctors surgeries and decide which one you want to register at
drink margaritas!
Refill any current medications for a few months in case there is a delay getting into a GP. And see if said medications are available in the UK.
eat queso!
Wander through Target/Walmart/any grocery store
drink margaritas!
I'm sure I can come up with more....