These symptoms could be due to a refractive error and you may require prescription glasses. Also if your lids stick together in the morning when you get up then you may be having infection or blepharitis in your eyes. You need to see an ophthalmologist/optometrist for confirmation of the diagnosis. Thanks and best wishes.
Follow-up questions are most welcome.
You will also need an orthoptic work-up by an ophthalmologist to rule out a latent squint which is not obvious otherwise. It is also possible that you have a refractive error and it was missed by your ophthalmologist. Yet another very likely possibility could be convergence insufficiency especially if you have difficulty after doing near work. You may see the same ophthalmologist or a new one for a second opinion. Thanks and best wishes.
i have seen a orthopic also he said the same
Then you may see a physician or an ENT specialist to rule out sinusitis. It is more likely if you have a stuffy nose. Thanks.