@BernadetteRostankowskiWolowitz
Honestly it sounds more like getting used to the responsibility than the house itself.
I fond the best way I can manage anxiety is preparation and organisation
Preparation - direct debit a set amount each month into a "sinking fund". This is your backstop for if you need it. Not that it's likely to happen but (eg) you do find dry rot. The boiler packs in. Etc.
Organisation - make yourself a lengthy snagging list of all the stuff (big and small) you want to do in the house. Anything small/cheap/can be done by you then goes onto a checklist. Give yourself a good year to chip away at it all. Any large/expensive jobs that require trades etc, get some quotes then sit on them. Decide which are needed and do those first. Then do the desirable ones. Dont push yourself to get these larger jobs done quickly. One a year.
Enjoy your home. They are good investments and you sound like you have chosen well.
OP, I felt a bit like you with my new house too.
This post above (plus seeing a GP and addressing your anxiety), is the answer.
For me, after having the boiler break on day 1 and having to pay to replace it (!!), I added up the cost of every possible thing in the house, divided it by it’s expected lifetime, then put aside that amount every pay in a ‘sinking fund’. So when the boiler breaks in another 20 years, I’ll have the money for it :) or if the oven breaks next year, it won’t have made the 7 years I predicted, but the money will still cover it. Having the well padded sinking fund is very reassuring.
Secondly, as in the post above, I got some small jobs done - changing the locks, blinds installed, etc. I didn’t know how (or who to hire!) to do them at the start, but I asked people, googled and learnt, and each time I did something, the house felt more ‘mine’ and I felt like a real builder! Even if all I did was pay for someone else to do all the work!
Thirdly, I tell myself something WILL go wrong. It is just the way life is. Something will. But I can’t sit and dread it for the next X years! I have put aside money to pay for it, I try and deal with issues as they come up (so as whatever it is won’t get worse) and after that I don’t worry about it, because I can’t. I try and educate myself where possible - my garage needed a minor repair, and I took the opportunity to ask they guys about expected life of automatic garages and service checks etc. They were so happy to talk about how to look after it. I try and learn more from every person who comes out to the house.