I can point you in the direction of more forums where you may be able to find useful advice.
This is one for fathers based in Australia, which maybe useful, as you said that's where the mother has moved to:
http://forum.dadsontheair.com/
The financial matters you mention are of great concern to fathers on that forum, and they have a very low opinion of their own CSA, hounding many fathers to the brink of suicide for example (it may not help you to know that but at least you will understand there are many others facing a similarly bleak situation).
I am based in the UK and have a long and fairly mixed experience of family law to relate myself, but I won't bore you with it here.
There are many lawyers in the UK of course, although you will no doubt want one fairly near to where you are living (so giving you details of mine won't necessarily help you obviously). Some lawyers here are particularly pro-father, or aware of the obstacles placed in our way (I'm thinking of one based in Bristol who is very critical of family law and attacks the government's fudged proposals whenever she can in TV interviews - sorry I can't remember her name, but I can try to obtain it for you perhaps).
If you are wondering why all this appears to be happening to you, or to your husband then I can cite a great many articles to you, or send you to a huge number of websites for information (having spent years looking at this kind of thing).
Although I believe the system is all wrong, or at least biased and twisted by false premises or procedures, I do know that there are alot of people (probably fair to say "mothers" primarily, though there are many fathers too) who support many aspects of current family law in the Western world. Recently I entered into a discussion on a forum for Non-Custodial Mothers (I know its odd of me to be there but I'm not the only man contributing to the forum). On this forum the recent father's day was being mentioned, and I've brought a comment made there to this forum, next to CD's post on the subject. If you take a look at the comment, you will find sentiments expressed that probably many mothers feel, that there are special qualities only a mother can bring to their child, or special bonds between them.
You would think that those sentiments would sit uncomfortably alongside the stated aim of the NANCM forum to promote equal or shared parenting, and one founder member did try to counter those views somewhat. However, I think it remains true to say that fathers are seen as different, possibly lesser beings, or lesser parents when it comes to our children. Maybe I think that way myself to some extent, but I do not think that "lesser", if that is what we are, or some of us are as parents, should have to mean fathers become excluded and have no role to play beyond paying for their child.
Anyway, the main point I'm trying to make is that some of these mothers, who tell me they've had a rough time with the fathers of their children (which I'm prepared to believe) seem to feel fathers are either expendable, or replacable by other father figures, or if not that then our roles in our children lives should be whatever they think it should be rather than what we feel it should be - if you see what I mean.
Hopefully I've given you some context to place your current feelings of helplessness in, even though I'm sure practical assistance would be better for you, which unfortunately I can't give you beyond pointing you towards other sources of information of course.
Very best regards,
Graham