fear of catching illnesses

ive been diagnosed eith ocd for over a year and thought ive been going to therapy, i still have a fear and obsession with catching possible disseases. it consumes my time, my hapiness and even thougjt doctors tell me im fine i still feel like im contaminated. does anybody have a simulat expirience?? if so what have u done to help urselfves?? it gets so overwhelming to the point where i start crying and having panic attacks because i think im contaminated.