I feel your pain and am sorry for your separation anxiety. I go on a lot of business travel and am always thinking about my woman & yorkies when not busy working. But its a part of the job and a part of life. So you have to be strong and know that you will be back together soon. It could be a lot worse... What always bothers me more than anything is the way they wait at the door (so I am told) for me for the first couple of days to come home before they start to act normally, but I do get a special spazzy greeting when I finally do come home.
One thing I have learned is dont talk to them over the phone, it only makes it worse because they think you are around.