My wedding is next week and the nerves are creeping up! Any tips?

I'm getting married next week and I am getting SO nervous. My brain keeps going to worst case scenarios and I can't get my head right - what is the weather is shit, what if my dress isn't as nice as I thought, what if something goes wrong, what if the cake gets smooshed on delivery, what if the speeches are embarrassing, what if my pre-wedding tan is the wrong colour... I AM SPI-RAL-LING (to say the least). I've not really talked to my fiancé too much about it because I don't want to stress him out. I think it's just because of the time between having everything planned and now the day is finally around the corner I'm just reaaaally anxious! I'd love some tips to calm my nerves - I want to be excited, not one bad thought away from a panic attack! Thanks so much xxxx