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You have done the right thing by giving a thorough eye wash.
If you have started putting lubricating eye drops then you need to continue it for few more days.
If you have'nt the it is better to start with lubricating eye drops such as preservative free refresh tears eye drops , available over the counter.
It is likely that the saw dust has abraded the superficial layer of the cornea and is thus causing pain.
such corneal abrasions heal very well and usually by 24 hours the healing is complete.
If it is hurting a lot then at bedtime you can put lacrilube eye ointment and patch the eye. By morning the eye should be better.