Hi,
Humming sound in ear, fullness, changes on 
Valsalva which you should not have done cause all the symptoms by transferring the air and fluid from nose to the middle ear. I would advise you the following in such a situation:
- Stop blowing the nose
- Do not instill anything in ears, no irrigation at all as this would enhance fungal growth.
Consult nearby ENT Surgeon who would do ENT 
Endoscopy to know the exact cause, may ask you for tests of blood and X-rays or 
CT scan of mastoids and nose with 
sinuses. You will be advise appropriate antibiotic, anti-inflammatory and decongestant medicines as per the findings. May take about 3 weeks.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General Surgeon