I set off on a long trip once, it was a sea voyage on my small boat. Before setting off I met a wonderful couple who wanted to buy my house. Well the house had already been sold, but the guy said something that caught my attention. He said "you'll be miserable at times, but it will be a great adventure." Yes, it was miserable at times, but when it would get depressingly so I'd think about the adventure part and say to myself "ah yes, but this is an adventure." and it pulled me through just fine.
Thing is, adventures can be miserable, but the excitement, the unknown, the thrill of it all will pull us through just fine.
Good luck on your trip and remember to enjoy the adventure of it!
LJ