I just looked online to see what chinese white sauce is made of. And this is wht I found:
http://www.tarladalal.com/recipe.asp?id=4188
Just dawned on me when I was looking this up what you had is called Lobster Sauce. Usually it has lobster meat in it. But it can be used with other things like shirmp or more plain dishes. I had it once and did not care for it.
Let me go see if I can find a calorie count for it sense it can be made different ways and with different foods.
Ok found it. I googled basic lobster sauce calories and came across calorie count website (don't know if the link is ok so I am ommitting that) and here is the stats for basic lobster sauce:
Per serving - 361 cals, 21g fat, 14g carbs, 26g protein
Now theirs is not a basic sauce like what you had and I remember. What I had did not have anything added.