Is it normal to have temporary vision loss in just one eye?

No. Vision loss is never normal and should be evaluated promptly by an eye md. Sometimes, having temporary vision loss can be a warning of something more serious and preventable. Get checked out.
No. The most benign thing this can be is a migraine. This is often the way carotid artery disease presents...As eye strokes. You never know which one will be permanent, plus the risk of brain strokes. This needs to be dealt with asap!
NO! If you are experiencing amaurosis fugax (temporary loss) this could mean something very serious like temporal arteritis, carotid stenosis or pseudotumor. Get checked by an ophthalmologist right away - this is serious.