These symptoms seems to be due to infection bacterial or fungal (because of white patch
which you have seen). Throat have lot of lymphatic tissue which gets swollen during infection as a defence mechanism but if suelling is too much then it itself is a pathology.
You should consult a ENT doctor to find out what kind of infection is it by throat swab culture and physical examination
oral or IV antibiotics may be required in this case based on culture results and senstivity pattern.
\Hope this helps