Going on vacation idaho to mexico but sprained my ankle a week ago and can barely walk will a walking boot help on vacation so i won't need crutches?

Yes: Often a bad sprain is put in a walking cast for a few weeks to let it calm down. Common sense says it would help on your vacation.

See doctor: If symptoms are significant enough that you are still having pain with weight bearing you need to see the doctor. It is possible that you have a more serious injury such as a fracture or ligament tear or high ankle sprain. Further diagnostic studies with at a minimum an xray are needed. This definitely needs to be done before what sounds like will be a wonderful vacation.