Hello, welcome to the website. My name is Tony, I can assist you with this.
This sounds like the house is simply not fit for human habitation. This is an essential requirement for any residential letting - that the person living there can safely live there and it is fit for this purpose.
If the landlord contnuinally refuses to resolve this, and you are being made unwell because of it, then you would likely be entitled to end the tenancy agreement and move out.
You would need to give the landlord a clear letter to this effect, so he knew that you were going to end the tenancy.
I have told the landlord and also sent a letter from my doctor explaining the pulmonary embolisms etc.
Okay. Then see what his reply is, and if he refuses to rectify the problem for you quickly now, then you would be entitled to walk away from the premises as this is damaging to your health. It sounds unfit for habitation.