Welcome to HCM.
Severe throat pain,fever is most likely due to severe tonsillitis
Swellings in the neck is due enlargement of lymph
node after secondary infection form tonsillitis.
You have to take nsaid with decongestant.
Start antibiotic like amoxy/clavulinic.
oral gargle will be helpful for fast recovery.
,calcium,d3,minerals supplements are advisable to improve your general health and boost up your immunity.
Avoid cold drinks,ice creams and deep fried foods.
Keep in touch with your doctor.