hi there ,
thanks for writing to us,
I understand your position,
It is advisable to confirm your fever
are not due to your infected fistula and check the seton (switch) made the fistula to heel completely or not.
A seton might be tied loosely as a palliative measure to avoid septic and painful exacerbations,if there is any tightening it also causes pain.
As your condition is getting worsening it is advised to go to ER,as you wont able to get an surgeons opinion now.
let me know if you had further queries
thank you and take care