How can I de-stress?

[autumnbreezed]

All I keep on doing is over thinking and panicking and wondering if I have everything prepared and ready, I think I do, I just can't calm down.

Try to keep calm everything will be fine, perhaps write a list of everything you need and tick if all off so you can see visually everything you need is packed and ready.
Try having a relaxing bath in the evening with a couple of drops of lavender. Watch or read something you enjoy to take your mind off it. Try taking some deep breaths in and out and let your shoulders drop so your not tense