Dear Amber 23~
Welcome here to the Forum, a new experience for you, and that first post may not have been easy, however it is most appropriate under the circumstances, you are not a servant..
As I'm sure you know a partnership is just that , each person sharing the load and most importantly, wanting the best for their partner, easing their problems and giving them happiness -in short love.
There has to be some sort of balance, that does not mean each shares every task equally, you don't both have to mow the lawn etc, however each should feel they are a cherished equal.
From what you have said there does not seem to be any balance, you both initially wanted a house and to have children - and both worked.
Quitting his job and trying a home-based career can be OK, provided it is a mutual agreement, practical, and has some limits. 2 years seems to be to me an awful long time for you to carry the load of the whole household. If it was part of an agreed plan and you had both set a target date, that might have been ok, always provided it was a realistic goal.
This does not seem to be the case here, it sounds much more like your husband has become content to let things go on as they are, and in the process has spent more and more time on the commuter and less with you. Maybe the computer has taken over more of his life than either of you anticipated. Now it would seem he wants nothing else
Can I ask if in fact there was an initial agreement between you, including a time-scaled business plan with a contingency if things did not go well?
Even if there was, it is very much time to have an earnest discussion with your husband and for you to lay out the burden and effort you have put in, plus the dreams you (quite rightly) have and see if you can come up with some sort of agreement you both can live with - maybe involving him working part time, maybe his admitting the home business is not going to work, I don't know
What would you think is reasonable for your relationship to get back in balance without your having to keep on being the only support?
Might I suggest it could be easier if you worked this out in front of a family councilor (Relationships Australia - 1300 364 277 have one such service). Taking such a step may well make him realize how serious the situation has become.
Apart from this do you have anyone you can lean on at this time, a family member or friend perhaps? Trying to cope all by yourself is very hard
You are always welcome here