OK speaking from a realtor view as well as a property manager of over 75 apartments throughout phoenix, you have a lot of options... number one if there is mold you can sue him because that is a medical hazard, be careful because of your medical conditions... they will get worse... number two you make all the repairs yourself and then refuse to pay the next month's rent... You can also move out of the apartment or house on the grounds that it is uninhabitable... please be aware that regardless of what choice you make, make sure you send him something written about the problems... I'd recommend sending it certified mail and keeping a copy for yourself of the letter.. once he gets the letter call him and ask what he plans to do... if he says nothing or I need time... you can get a hotel room, which when you take him to court he will need to pay for (but I don't recommend this)... either fix it or move out... if you need further assistance or advice email me... firstname.lastname@example.org... I'll be happy to answer any questions you got, or explain in more detials.... for your health, if there is mold I recommend getting out... and you won't owe a thing... just make sure you send that letter and take pictures of whats wrong...
Hope that it goes smooth for you...
Email if you got questions
You will not owe him any money... trust me... I know the landlord tenant laws