What should I do if our landlord does nothing to fix the problems in our house?

Ok, so we moved into our townhouse late November of 2012. We got a tour before we moved in and the place looked great! The woman that gave us the tour promised us new floors in the kitchen, new cabinets in the kitchen and a new stove after the holidays. Well, its now march of 2013, and we have had nobody to come and do what was promised. Apparently they promised this to the previous tenant, or so I have heard from our neighbor. The sink also leaks behind the wall in our upstairs bathroom, and trails all the way down to our kitchen through a little hole above the stove. When you open the cabinet above the stove, there is white and black mold covering the entire right side. I’m pretty damn sure it takes a while for that to grow like that, and I can only imagine what it’s like in our bathroom wall. I have notified the realtor company at least 3 times and they have done nothing. We become very ill if we stay downstairs in our kitchen or living room. So we are always cooped up in our bedrooms upstairs. Our neighbors tell us that the landlord does nothing to keep up with the place. We have a list of other things that need to be fixed as well, and we haven’t notified the realtor company due to them not doing a thing about the mold problem. What should we do? My mom is going to continue to pay the rent on time for a couple more months, and is going to put it into an account until they fix the problems in our home. Is this the right thing to do? I live in New Hampshire, and I am not quite sure if other states have different laws that pertain to this issue.