External application of Vicks is safe, ho na. I used to apply a little on my neck and forehead for headache. Just avoid taking any steam with medicines without asking doc.
I used it on my forehead last week when I had a bad cold, it felt safe. But did your doctor say anything about using it on the chest? Let me know if you ask them.
Yes, Vicks Vaporub is fine for external use when you have a blocked nose. Just don't overdo it or put it near your nose too directly. If your cold is severe, skip the home hacks and call your gynac.
Oh, I remember crying because of a blocked nose and being scared to use even Vicks! Yes dear, applying a little on your throat or forehead is totally safe and gives so much relief.