My suggestion that your husband seek a consultation stands.
Spousal support is an issue that rests within the discretion of the judge.
The judge is not overruled absent an abuse of that discretion. There is no formula that is applied. A proper analysis requires knowing the facts that suppounded the origional award and what circumstances have changed. Based upon the relative short length of the matrriage and the relatively long period of time that support has been paid, a review is in order.