counter suing landlord/tenant?

i lived in an apartment from august 2010 to november of 2011. my lease was from august 2010 to september of 2011. from september to november of 2011 i was on a month to month basis.

about february of 2011 mold began to grow on window seals and in bathroom ceiling. also under kitchen sink. Also the tiles inside of my shower began to break and mold was underneath them. i called my complex to come and fix the situation and they never came. since i had a infant living with me 3 days out of the week i was concerned and irritated with the fact they were not taking it seriously. i contacted the housing authority in my area and they sent me paperwork to give my complex. it stated that if all the issues were not fixed within 7 days i would be able to vacate without being responsible for not giving a 30 notice of leaving. they did "fix" the issues, so i thought. they also suggested that i buy a dehumidifier for the bathroom, because apparently the fan in my bathroom was not doing the job after showering. they also suggested to lower the temp on my heater. again, i had an infant in my home for 3 days 2 nights out of the week.

a few months later the mold came back, i noticed that the tiles in the bathroom that were falling out were never taken out, and they basically plastered on a hard plastic lining over the problem areas...

also what they used to "get rid" of the mold was a type of spray paint that they claimed killed the mold/mildew. at this time i cannot remember what the name was, but i do remember i researched it at the time and it is supposed to be used on drywall before applying the paint so that moisture doesn't get into the drywall. but they used it on top of paint.

anyways, i paid my rent in full on the the first of november 2011. I did not give a 30 day notice, but i did supply with more paperwork stating i was leaving bc they were unable to properly fix the mold/mildew and moved out. they did tell me that i was responsible for another 30 days of rent but i refused and still moved out. i recently received a letter from collections for over $1000 bc i did not give 30 day notice. which i obviously am disputing.

so my question is: if this continues to court, am i able to counter sue them for the inconvenience and/or the living conditions of my apartment?

i have proof of all my paperwork, and also pictures of the mold, both times it happened. i also do have proof that i did what they said by getting a de humidifier, i still have the receipt of purchase.

sorry this was so long..