The most common cause of redness in the whites of the eyes is infectious eye disease, but when there is also eye swelling, especially when accompanied by blurred vision, headache, nausea and vomiting, you need to be alert to the occurrence of acute angle-closure glaucoma.
In this case, you should go to the emergency ophthalmology clinic of a nearby hospital as soon as possible for IOP measurement and slit lamp examination to clarify the diagnosis and active treatment.