Dear Sri. Yamaka, Greetings.
I have a feeling, your uncle suffered from 'dry yes'. The symptoms seem to indicate that. It is possible, he was not crying from pain. Watery eyes: MedlinePlus Medical Encyclopedia
one of my uncles (at age 57) died after suffering for 30 days - doctors could not give adequate medicine to subdue his pain - we saw tears always in his red eyes.
I have a feeling, your uncle suffered from 'dry yes'. The symptoms seem to indicate that. It is possible, he was not crying from pain. Watery eyes: MedlinePlus Medical Encyclopedia