There's not enough information and you should not write anymore on this site. Instead, you should contact a landlord tenant Attorney or personal injury Attorney in your area immediately for a FREE evaluation/consultation. The attorney would need more details. Also, did you inform (notice to) the landlord of the leaking problems (to fix it) or that there is mold in our home? The attorney will probably going to ask you for more information, look at your lease agreement and medical records. You might have issues with statute of limitation (SOL). When did you leave the place and realized that there was mold and it was the cause of your symptom. Personal Injury SOL is 2 years from date of harm/injury. Good-luck!
Speak with an attorney, personal injury type and as was previously pointed out to you, your ability to bring a lawsuit ends 2 years after you discovered your injuries.
A proper response would require a thorough investigation into the history and background of this relationship. The information provided above is just that, information, to be used as you see fit.