hi there, thanks for the extensive history. From your earlier discription it does look like you suffered from some sinus
problem earlier and it could have led to an inner ear
dysfunction leading to the symptoms of imbalance. However as you have had a half-hearted treatment for the same and your condition doesn't seem to have resolved it would be a good idea to visit a general physician followed by a neurologist
with a few battery of tests like an x-ray PNS and an FNAC of the lymph
node and if recommened then a CT scan
for a thorough investigation. It is a better thing to get examined totally rather in parts as something vital may be missed out. Take care.