Red face, itchy eyes and swollen glands. What is the cause of this?

Allergic reaction. Your description sounds like an alllergic reaction. Try taking oral allergy meds. If no improvement or worsening, see a regular doctor.
Depends on the cause. There are many causes of itchy eyes. Several types of inflammatory conditions, allergic reactions, and sometimes bacterial, viral or fungal infections can cause itchy eyes. Have it evaluated by a professional and get the appropriate treatment.