For govt subsides patient how do you contact the Gynae if you need help?

For eg, Im on week 9 now and I have super bad gastric reflux that is making me super nausea, gassy and unwell which I keep on gagging non stop. Who can we call about medication advice? I'm with NUH but only can contact hotline there is no way to reach any gynae. Anyone taking Zenpro 20mg Omeprazole? Is it safe for week 9 pregnancy? I have been feeling so sick and can't do much due to this. Is it common to feel this uncomfy upper stomach to chest disgusting feeling? Is not morning sickness but more to stomach gas/wind/bloat