Separation anxiety and crate training

We recently acquire a 3.5 year old ****h Tsu - very sweet, loving dog, but 
does not tolerate being left alone.  We have to resort to putting him in a

large "crate" when one of us cannot be home with him and it's seems that 
over time he is having more trouble, not less.  Now he senses when we are 
leaving, runs the other way and generally resists the process.  When we
come 
back even after a short time (one or two hours) he becomes quite frantic
and 
cries/whines after we let him out.  The fact that his behavior seems to be

getting worse is really stressing us, but we don't know what else might 
help.  TIA for any suggestions.