Father In-Law Collapsed on his weight but kept conscious

Hello, I'm not asking for a medical advice, but I want to be directed to the appropriate medical discipline to handle the case.

Context:

My father in law is a 65 years old. He has a high blood pressure and diabetes.

One day, he was working in his farm in a hot, sunny day (+45C). He then collapsed on his weight and was unable to move but still conscious and able to talk. Upon collapsing, he hit his forehead on a very tiny rock and kept bleeding lightly for 1 hour before he was spotted by his daughter and rushed to the emergency.

One day passed and he says his left leg has barely any sensation can't stand on it.

I'm asking to be directed to a suitable medical discipline doctor because doctors in my country are money milkers and will take any case even if it is outside their specialty so that they can ask as much as MRIs, X-rays, prescriptions and make profit from you.