hello and welcome to HCM,
I must complement you, since you have very cleverly found out the relation of head bath and your symptoms and you are right in assuming that these symptoms increase when you take bath.
You obviously cannot avoid head bath for the rest of your life so lets see what we can do for your sinus
and nose problems:
1. Meet and ENT consultant and get an endoscopy
done of the nose to find out the state of the nasal septum
and the sinuses
2. Get a CT scan
of the nose and sinuses to further evaluate the state of the septum and sinuses.
3. Start an antihistamine medication and take that especially when you are planning to take head bath
4. Take steam inhalation regularly and avoid exposure to dust
take care and get well soon
Dr Sriram Nathan