I worry about every single little thing, no matter how silly/small.
For example, DH recently got a new laptop for his work (he's self employed) which cost a lot of money. I can't stop worrying that the screen size is too small for him, that it'll hamper him in his work and that he should have gone for the bigger size. I've said this to him and that we can upgrade it if he wants to (it's still within the returns period), but he says it's fine. He's asked me to stop talking about it now as he says it's getting annoying, but I know I'll be stressing about it in my head for weeks.
Another example - when I decorated the house I agonised for months over the paint colours and now the work has been done I'm still not convinced I chose the right ones or that it looks good. Same when we replaced the kitchen.
Is this normal and how can I stop?!