Hello, As per your symptoms, it could be an Internal Hordeolum or a Simple Blepharitis.
Both the conditions have similar kind of management.
You would require
1.Course of Oral Antibiotics
2.Anti Inflammatories and Pain Killers
3.Hot Fomentation twice daily for 15 days.
Next Steps
It should start subsciding in about 3 days, if not its better you visit a Doctor.
Health Tips
It may even end up as Chalazion if the above condition is not resolved. Do not worry, This Happens very rarely.