check out the community forums at
Divorce Source: a legal resource for divorce, custody, alimony, and support.
Everything I've ever read there says that the spouse's income should NOT be considered when figuring child support. Your income is irrelevant and has nothing to do with his prior obligations. It should be based on his pay, and his pay alone. If he isn't working full time, or is currently unemployed then they would impute a wage to him that he is capable of earning, but it is not based on your income. I would recommend you consult with a lawyer.