Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
Headache and cold related problems in spite of nasal septal correction, turbinoplasy and FESS can be due to other causes too.
Hence Take an opinion of a Neurologist
to rule out any other problems.
You still have to continue with steroid
nasal sprays, and other medications even after such extensive surgeries to get a proper benefit out of these.
Your another problem of squint
or Estropia may not be related to the sinus problems unless there is hypoplasia
or anatomical variation present in the sinuses
or its outlets. Consult an Ophthalmic Surgeon dealing with squint alone to get the best possible diagnosis and management.
Hope I have answered your query.
Let me know if I can assist you further.