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After having gone through your detailed question, all I can say is that there cannot have been a foreign body in your left eye for almost one year and none of the doctors would have picked it , is very unlikely. Our conjunctival sac ( white of the eye seen outside) does not have any communication with the inside of the eye. Because of this , no foreign body can enter the eye without actulally penetrating the scleral wall ( very tough structure , only a very sharp object can penetrate it , causing a scleral tear.) or the corneal surface( an object can penetrate the cornea but it leaves a corneal scar permanently which reduces vision , and moreover these type of tears are never missed). Thus it can be assured that there is no foreign body in the eye . If at all you do suspect an underlying glass piece, let me inform you that it would have resulted in a reaction in the eye causing redness/ foreign body granuloma, apart from the pain.
The possibility of any nerve damage is also not likely. Problems arising from nerve related damage or involvement, cause different type of presentation , usually painless. Corneal nerves if exposed following injury or foreign body in the eye, cause severe constant pain, watering, redness followed by reduced vision
You need to be convinced that there is no foreign body (FB )in the eye by doing an ultrasound
of the eye ( non-invasive procedure), done by an ophthalmologist
. If this has already been done , with no FB found, then there should not be any doubts left.
Since your main cause of worry is a persistent pain in the left eye , there is a likelihood of dry eyes
. This is further confirmed by the fact that sleeping reduces the pain ( eyes are closed), it worsens on awakening. You will need to put lubricating eye drops constantly like preservative free Refresh tears , 1 drop 4 times a day.Thanks and best wishes
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Views expressed are for information purpose only and cannot substitute a visit to an ophthalmologist