Thanks for your query.
According to your description, you are having sore throat
and difficulty in speaking, it indicate upper respiratory tract
infection, usually it is caused by viral infection but it may be bacterial. It changes your voice or creates difficulty when infection involves larynx (laryngitis
Commonly it is triggered by smoking, GERD,extreme tiredness, and allergies.
You are advised to take rest, drink large amount of water.
Gargle with warm salt water.
Treat Heartburn if you have it.
Take vapors by shallow pan of water to provide moisture, it relieves hoarseness
or ibuprofen can be used for pain.
Decongestants can be taken orally or used as decongestant nasal sprays.
For further management and information please visit your doctor.
Hope it helps.