There are seven main things you may be able to do:
Move out.
Have the problem repaired and subtract the cost from your rent.
Contact local code or health officials.
Sue to get back part of the rent that you have paid plus other expenses, and/or reimbursement for property damaged or destroyed.
Withhold rent until the landlord makes repairs.
Get a court order to require the landlord make the repairs.
Recover payment (damages) for severe emotional suffering; or,
Use a combination of these remedies.