My wedding day is just over 2 months away and I am starting to feel the panic! Not about getting married, I'm sure about that, that's the easy part

There's been a few set backs during the planning which have upset me. My wedding ring has had to be sent back 3 times as it's wrong, my bridesmaids dresses are different (should be the same dress), my hair trial went badly (another one tonight so fingers crossed!)
I'm finding that my anxiety is really playing up, I'm getting panicky and I can't sleep properly thinking of everything that needs to be done! My partner is brilliant and he is doing what he can.
Although I know there's loads to do, I still want to be enjoying this time and not be a nervous wreck by the wedding day. Has anyone got any tips for planning, relaxing, organising everything so it's not taking up every waking thought?
Thank you 🥺😄