Hello Your mother got Chickenguniya , while she stopped the treatment for fliariasis . Chickenguniya is a viral disease while filariasis is caused by worms . One year back your mother stopped the treatment . Usually , according to this history your mother is having lymphatic filariasis. As you mentioned that there is nerve -knots , These are blockage of lymphatic system , hence if treatment is stopped naturally symptoms will flare up , so take treatment as this is acurable disease. Consult your physician and take treatment .