anticipatory butterflies

Almost time...we leave tomorrow evening so today is the last day for preparation.  Picking up cleaning, getting stuff packed ahead of time.  Cleaning the house and doing some laundry.  Have to get our son from the airport as he will be housesitting and taking care of the dogs (one less big worry).
It's becoming very clear that by tomorrow we will be on our way, and I have to admit to anxiety, stress, worry--all the bad stuff that clamps down on the good feelings of excitement and anticipation that someone with less OCD would be experiencing.  But I am what I am.  Worrywort par excellence!  At this point my biggest worry is about jet lag because I really felt it when I went to Paris and that was years ago.  Now I'm older and thus, it might hit me even harder.  In Paris I spent a day in bed feeling awful so I don't want a repeat of that experience.  All I can do is try to sleep on the plane and take the No Jet Lag stuff that I bought.  Lots of water, no alcohol.  Stay up the first day and then go on local time for sleeping.  We'll see and I'll chronicle it, of course. 
We have duffels for carry-ons into which I will put my ipad and my purse and my pillow.  Also, lots of vitamins, nuts, granola bars, etc.  With 24 hours before a shower I'm sure we will both be funky and stinky by Sunday when we check into the hotel. The weather reports are saying high in the low 70's and dry which is perfect weather.  Low in the 40's at night, so definitely jacket weather.
Another worry is the transportation system in  London, specifically the Oyster cards which we will buy.  This allows transportation within several zones of London, but I'm not really clear on the zone system.  Hopefully, we will be fine. Not enough time in London, I'm sure of that.  We could spend the entire vacation in London and not see everything, so I'm already thinking of this as Trip #1 with more to follow.  Would love to go to Ireland and Wales, but no time, no time.  I feel like the White Rabbit.
Got British pounds in hand and am really trusting that my ipad will be up and running (WiFi signals are necessary) so that we can make use of the apps I have for London.  Still need to purchase bus tickets for Swindon.