Just guessing (since it was one of the first things you said) that your family is stressing you out more than anything else. Do you contact your family very frequently? It would be best for you to limit your time with them considering the way you are feeling. Don't feel like you have to answer the phone or contact them. I have very emotional parents and I didn't learn to deal with them until my husband taught me! Basically, he taught me to change the subject when they are trying to guilt trip me, come up with excuses to end the phone call (pregnancy provides plenty of excellent excuses), and above all never provide too much information that they can use against me (don't get too personal - and never talk to them about how you're 'feeling'. Offer a couple of supportive words and then chane the subject when they start talking about how they are 'feeling'.) Your husband is your outlet for how you are feeling and it sounds like he is pretty supportive. My husband has so many friends and is very close to his family, yet he never talks about anything 'deep' with them at all. Sometimes, it drives me mad, other times, I understand exactly why. It makes him a happier person in the long run.
Financially - I was in your position (but without a baby) a couple of years ago, and since we sold our house and no longer have a mortgage I am much less stressed and happier. We also both have higher paying jobs now. Obviously I'm not saying you should do the same thing, but I guess I am saying that circumstances can change quickly and without warning - I never thought we would sell or move or change jobs - so tough it out and try to remember that it won't be forever, even if you had the money very soon leaving the house will not be an easy thing so at least that is one less thing you will suddenly have to get used to when the baby arrives.
Also, being 'supported' financially and otherwise from friends/family can actually get annoying. If no one is trying to help you, console yourself with the fact that you are allowed to do things your way without any resistance.
It sounds tough and it sounds like you are really wanting to have someone to talk to but I would actually recommend otherwise, I know what that feeling is like and honestly what I have learned from my husband is the less time you spend thinking about your feelings, the less you actually have them and that can be good for your emotional health. You don't have to make sense of everything you are feeling, it's ok to ignore your feelings sometimes and sometimes it is just better. Plus, if you are only talking to your husband, that's good, he'll give you one opinion and you won't be swayed by several different people's opinions (ie those of your family who think you are 'emotional').
Also, go and visit your husband's friends just at their houses or something, doesn't cost anything, gets you out of the house and keep yourself busy even if it's just with tasks around the house to stop you thinking about negative things!