Are you a wildlife carer/rehab?
Was the vet experienced in bird fecals? They can be confusing to non-bird vets. And coccidia can be normal findings in some wild birds. What medication is he on for that?
What is your geographic location?
Can you be more specific in describing the "neurological" appearance? Did he possibly strike a window?
Infrared lamps can cause severe burns and they are coated with teflon. A hot water bottle, heating pad are safer.
A cage is not the safest environment for a bird with ataxia, incoordination, or weakness, especially a wild one who does not understand cages.
Move the bird to a box or carrier with soft towels in the bottom, no perch, and food and water in low bowls that can be reached easily. Put the whole thing on a heating pad on low or medium. Check it frequently, no overheating allowed! Keep the unit partially covered, warm and quiet. White paper towels or white cloth towels will show the true color of the droppings. Small animal/reptile boxes are great for this purpose.
The bird, bowls and unit must be kept very clean.
Here are some helpful links: