you sort of need to scramble to make a timely appeal--otherwise the order is sort of set in concrete against you .
you sort of gotta use skilled counsel! You are destined to blow it w/o same---logical economic points may NOT be useful legal points. And you sort of need a pro to present it in fashion that makes sense to court per its expectations .
1. Like it or not you have burden to present clear picture.
2. In a situation where you don't get pay stub/W-2 you are still left with need to make it crystal clear what you are being paid.
3. There is always the smell that in situations like yours you can use business to offset some personal expenses--it even borders on assumption that you do hide income. Court may be saying without so saying--we smell a rat until you show otherwise.
4. I fail to see where to work harder is a legal requirement. To voluntarily work less however is a problem . In your post it seems there was less work available--but burden is for you to so present it. (And there may be admissibility of mere affidavit as a hearsay problem )
4.1 In your situation I think you were wrong not to close the door on speculation of your work reduction being voluntary or under your control by a clear demonstration of seeking to preserve income by seeking new clients (Unless under some noncompete clause as sole provider) Int s natural economic thought if you business with client A falls off 50% that you be seeking new business clients B, C, D and so forth --and you sort of need to show you searched hard but B,C,D are not out there in 2009--better yet to show you searched and did find B but to date B is only adding 5% of the 50% gap. .
The view of court is probably to protect child---and by itself your being a bit of a business mess is not a reason to leve kid high and dry via lower support. Current problems are not a good excuse as to past debts--so be careful. Current problems may be an affirmative defense as to inability/impossibility to pay
It appears you have a window to reposture your case by curing gaps etc--I strongly suggest you use skilled counsel NOW! Your results absent same are predictable --failure!