My left eye also waters.
I have had a blocked nose & cough for around 10 days as well.
Welcome to the MedHelp forum!
In all probability this is due to upper respiratory infection with sinusitis. Pharyngitis, tonsillitis, sinusitis or basically an upper respiratory infection can be due to several pathogens. Hence some tests are needed for final diagnosis. Meanwhile you can take an OTC anti-inflammatory and do warm saline gargles 2-3 times a day. Drinking warm lemonade, hot clear soups and herbal tea may soothe the throat considerably. Do a valsalva maneuver (Done by taking a deep breath and blowing while pinching your nostrils and closing your mouth) to relieve pressure from internal ear and blocked Eustachian tube (tube connecting ear to throat). Relieving this pressure may relieve some symptoms. I would strongly recommend you to consult an ENT specialist. It is difficult to comment beyond this at this stage. Take care!