Nauseated & Dry Heaves - Sinus Congestion?

I am 4 weeks post op. This morning I woke up with a lot of sinus congestion and felt really nauseated. Before I knew it... I was dry heaving. It was a little scary... just kinda zapped me. Is there any limitations to sinus meds? I usually take Sudafed. Thanks, Leeann Pre-Op 324 Op Date 315 Current 283