Ask a landlord-tenant lawyer and get answers ASAP
Good Evening, I'm sorry to hear about the mold and the effect it has had on your health. Can you tell me more about the mold? Do you know if it is black mold?
In the meantime, I can tell you that it sounds like your landlord has breached the implied warranty of habitability. Assuming that there is a direct link between your recent hospitalization and the mold that he forgot to mention, this presents a continuing and existing nuisance to your health. Your landlord has the obligation to fix this and maintain the property in otherwise reasonably habitable condition.
You are entitled to move out without giving the landlord any notice. However, I would take photos, if you can obtain a sample of the mold for later testing and write your landlord a letter detailing the circumstances. The monies that you have spent in order to remedy this are also recoverable, but you will have to file a lawsuit.
Civil Code 1942 specifically addresses this situation. Also there is case law which indicates that cockroaches, peeling paint, torn carpets and mold are items which offend the implied warranty of habitability.