When you have excessive salivation, excessive fatigue and unable to speak, just a mild infection. You have a mild cold where your taste is being altered or you have an ulcer in the mouth or the throat where thee e ulcerations will be increased and will be feeling a lot of irritation in the throat, you will feel stressed out and fatigued, but in any case excessive salivation, excessive fatigue and generalized weakness of the oral cavity can happen also in number of neurological condition. If you have an early signs of a Bell’s palsy which is a facial nerve paralysis, which can present in initial stages as just salivation or fatigue. Any viral infections, just like viral infections, they present with excessive salivation, fatigue and tiredness. In any case, wait for a couple of days. Take a healthy diet, take lots of warm water, and hydrate yourself properly. Make sure that you do not have any ulcers; you are able to eat properly. Wait for couple of days. If you are not feeling better, see your ENT doctor as soon as possible.