K.V.
I know that you have already closed this message, but you don't mention if you have talked to the landlord about this. You need to do that, it should be the first thing that you do. I had rentors that I talked to regularly. I always asked if there were any problems, or anything that needed fixed, and they always told me no. When they moved out, I found a leak under the house, causing a mold problem... I had lived in the house for 3 yrs before I rented it, and never had mold or a leak. They never, NEVER told me about it... INFORM THEM!!!!
If they say they don't believe you and won't come out (when you are home)have a mold expert come out and write up a report. If there is mold they will find it... this is your legal proof that you aren't just skipping out. Take pictures of the mold! Protect yourself, while you still have access and then move.
Write a letter asking that the landlord fix the problem... Also call them and talk to them, tell them to expect the letter ask them to come up with a different unit. Send a copy of the report from the mold expert and copies of the pictures.