Hepatitis C doesn't go into remission. You substained viral response (SVR)
which is the same as CURED of hepatitis C. You can't get back what you don't have.
Hope this is helpful
Plaquenil is very liver friendly and will not make the virus come back. In fact, if your virus is undetected and has been for all those years, there is no virus to come back. I believe you are worrying needlessly.