Sorry to hear you are having such a problem with condensation.
We had bad condensation and mould in our house and the only thing that helped was a home ventilation unit from www.nuaire.co.uk
It is not cheap by any means but you can pay for it in interest free instalments and it has a five year guarantee.
It also has a booster switch so if your house is really cold you can have a nice boost of warm air or, equally, in the summer if your house is too hot you can have a boost of cold air.
Condensation is not good for your sinusitis.
If this is too expensive then it would be best to open your windows as much as you can, especially when you are running the bath and cooking etc. Also don't dry clothes on radiators.
Hope this helps.
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