Runny nose, dry eyes / Herceptin only

I've noticed all along that after my Herceptin treatment my sinues simply close up for the next two hours. Went to ENT, got a nose-wash that's helped, also some drops that I think help. Also think nose-wash has kept away sinus infections this winter. My eyes are so dry I've had to start alternating contacts and glasses - Thera-tears helps if used regularly (not just when dry), but it's so expensive. This is my first time on this site and I've already yelped to myself a dozen times, "Hey, that's me!!" Thanks so much.