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Hi this is Dr. Hill. An allergic reaction to either of those medications would not manifest that way. If you are not able to wake her up, then she may have a low blood sugar or less likely swelling in her brain from the head trauma. I would rub some syrup on her gums and get her to a local emergency clinic asap. Can she stand up?
Okay, so at least she is able to walk. Has she eaten today? When was her last pain medication?
Also, is she on any eye medications?
If she is that uncomfortable, then I would take her into an emergency clinic tonight if possible. Do you know of one in your area, or can I help you find one? You said that one of her eyes was injured, but she is not on eye meds. Is she holding both eyes closed?
That sounds like a pain response (massive headache) or sensitivity to light due to inflammation in her eyes. Did she have any evidence of major head trauma (swelling in her brain or shock) when this first happened? How many days post injury is she? If you brought her home on Saturday and she was not acting this abnormal, then I really suggest you get her seen as soon as possible. If you don't want to take her to emergency tonight, then she needs to go in first thing in the morning to your local veterinarian.
The sudden change in her mentation makes me concerned about cerebral edema (swelling in the brain). It is not uncommon up to 72 hours post head trauma, especially since her head was swollen. I would get her looked at as soon as possible.
Do you need help finding a local emergency clinic?