Week 30 - nausea and cold sweat

Hi mommies to be, I’m in my week 30+. This morning while otw to work in mrt, I suddenly felt nausea. And within minutes, I broke out in cold sweat, breathless, dizzy and thought I was going to blackout. I removed my mask and staggered out of the train (not my stop yet). I sat down and felt better probably after 2-3 mins. Has this happened to anyone before? Should I go to my gynae immediately? Baby is still active and kicking. Just now I’m feeling a little unwell and nausea still. My morning sickness has gone away since week 18…