Since yesterday, all the sounds I am hearing has been harsh and loud to me, my head feels a little hot also, why is that?

An infection, maybe. Sometimes sinusitis and ear infections can produce these symptoms. These can be diagnosed and treated by a doctor or nurse practitioner. Your doctor can also help evaluate you for other things that might cause these symptoms.
See specialist. Any form of sinusitis or hearing problems should be evaluated by a specialist in that field.