Hello and welcome,
Thanks for your query.
Have you experienced a fever? Your symptoms match most upper respiratory tract
problems, and could even be an infection of the same area.
It would be best if you visit a doctor, a Physician or an ENT specialist
who be able to examine your throat and find the cause to your symptoms.
Do not worry about your voice and the pain while swallowing as they are all related to the possible diagnosis.
It is most probably an upper respiratory infection
and the pain you feel while swallowing is due to the inflammation of your tonsils.
A course of antibiotics and an antiseptic solution will rid you of your symptoms. You will have to visit a doctor so we can confirm the diagnosis and start the treatment.
I hope I have succeeded in answering your questions, you could write back to us anytime for further clarifications.