What to do if i do not know how or why i got it but my eye is getting swollen and it's red! and it's itchy. what can i do to make it better?

Eyedrops: Check to see if you are using a new skin product, as this can cause a reaction like this. If this has just popped up spontaneously, you can try using artificial tears 4x/day in the eye. If that doesn't work, there is a OTC drop: 'Zatidor', which works well. You can also use Benadryl, (diphenhydramine) but this will cause drowsiness. If these therapies do not work, consider seeing an eye doctor.