Hi thanks for asking question.
Here according to history most probably it seems to be generalised viral infection.Symptomatic management done for it.
Drink more water with fruit juices.
Antihistaminic need to be taken.
Analgesic can be taken if more pain.
But you have also mentioned about swollen fingers.
If joint over finger is swollen with
redness over it and
stiffness felt then gouty arthritis like condition also has to thought.Serum uric acid level estimation done.
If still no benefit and swelling increasing then
septic arthritis like condition thought and
blood culture can be done.
So just now continue with viral inflammatory condition and symptomatic management done for it.
Then if no benefit then according to physical examination further work up done.
I hope my suggestion will be helpful to you.