Sounds like morning sickness and pregnancy blues to me 
On a serious note, there is absolutely nothing wrong with such
feelings. I supposed you have been mummy's boy for a while, and may
not have gone on trips over extended periods of time, without your
family.
Well, normally, you will have a buddy in camp. Go and play games
and sweat it out and join in the fun. Tire yourself out during the
day, so you can have a good sleep at night. Sometimes, a cigarette
or 2 may just help. 
I travel quite a bit, and on days when there is absolutely to do, I
do think about my family. So, I try to keep myself occupied with
work, workout, dipping inside the hotel pool, or simply walking
around the neighbourhood.
