Hi Sam,
I was on Herceptin with a myriad of chemotherapy adjuvents over the years. Into my 12th year and 9 years of that was having Herceptin. Being HER2 Positive, for me this durg was my silver bullet. I definitely had hayfever like symptoms with this drug as I still do on Kadcyla which is a hybrid of Herceptin. Important you talk to your oncologist about your concerns or as suggested by SoldierCrab, at least call the BCNA helpline 1800 500 258. For me, it has been my scans that have picked up changes, second guessing just has you ruminating about what could be. Biologically we are all different so Dr. Google cannot be relied on. Hope this helps. Take care Karen C
