Hi I'm in desperate need of help2

No, you need a DOCTOR.

Wait a minute, though—if you really are possessed by an evil spirit, how do we know if this is you talking or the spirit?

I'm not a doctor and can't diagnose or treat you, but googling "eye pain" I found that sinusitis is a common cause of eye socket pain and can often be relieved with decongestants. Other possible causes such as glaucoma however can be much more serious and can cause loss of vision if not treated. Many medical insurance plans have a number you can call for a quick consultation over the phone, you might want to call and see what they recommend.

https://www.emedicinehealth.com/eye_pain/article_em.htm