My eyes are sinking into the eye sockets. Why does this happen?

The scenario you described is most consistent with a fracture of the eye socket and is not something that can be addressed in this forum or even with photos. You will need a face to face examination and diagnostic imaging like a CT scan and/or MRI for complete evaluation. This is not something you can delay because the older the fracture the harder it is to treat and the harder it is to reverse the accompanying soft tissue changes.

Hello mary262,Thank you for your pics and images. The reason for sunken eyes are multifactorial.  It is difficult to advise without a formal exam. However, it does appear there may be some swelling along the gland which makes water. The causes will depend on your medical history and detailed exam. The imaging does help a bit. The only way to have a concrete diagnosis is to get a sample of tissue which requires surgery. My suggestion is to seek out an expert Oculoplastic surgeon to have this discussion and management plan. Hope this helps.Cheers 

I believe it is complex case to evaluate online.
It is necessary to have the neurologist and the ophthalmologist's point of view because you had a trauma.