Travelling with Anxiety

I should really call this Travelling with excess baggage! That's what it feels like. I'm not just talking about the actual act of travelling to your holiday destination, but also the booking, the build up, the packing, the airport experience. The whole lot make me anxious and yet I love my holidays. Even writing about it now I'm feeling anxious!
Shouldn't I just feel grateful and very lucky that Gary and I get to go on holiday? An awful lot of people can't.
Sometimes I wonder if I'm getting the feelings of anxiety mixed up with excitement?
I'll try to explain as best I can.
An example is we are going away in May so last night I thought I ought to book our airport parking. The whole time I was looking for the best deal, my heart was pounding in my throat and before I booked it I had to keep going back to the holiday confirmation to check and recheck that I'd got the dates, times and terminal right. I haven't got it wrong before so I don't know why it worries me so much?
So that's the holiday booked, the car parking and the airport lounge. I like to go to the airport lounge to get away from the hustle and bustle of departures, I find it overwhelming otherwise.
The next thing to think about is the dreaded packing. Luckily, my wonderful friend got me a packing list that I can tick off as I go, so that helps hugely. Although, it doesn't stop me from unpacking and repacking a good few times and losing sleep over whether I've packed the right stuff or enough stuff or too much stuff and the cases are going to be overweight. What am I going to wear to travel in, what time should we leave to get to the airport, what if we get stuck in traffic, what if the plane is delayed and we miss our connecting flight. the list goes on and on.
Then, once that is all out of the way, I have to deal with the anxiety of leaving my cats and my parents. What if something happens to one of them while we're away?
Once we're parked up at the airport, the anxiety is heightened when I'm waiting in the queue to check the bags in (what if they get lost), waiting in the queue for security and at the gate. It's a good job I'm not scared of flying!
When we're on the plane I'm not too bad,although I hardly ever sleep even on long haul.
Then once we've landed the anxiety starts again with passport control, baggage claim, the transfer to the hotel, what's the hotel like and will our room be ok?
Then I can unpack and relax as best I can until I have to think about travelling home and then the anxious thoughts all start again....