U may be suffering from acute infectious phyringitis, if such amount of pain is there I will suggest u not to go for vaccination right now. Because symptoms of this disease can mimic post vaccination AEFI and we also can’t use NSAIDS POST vaccination.
For treatment of the throat part if u can share a picture of your throat that would be very helpful in guiding u further.
Next Steps
Feel free to consult with detail history for further guidance and prescription