I'll be interested to hear any replies to this. I take four other tablets every day, plus during my first trimester I had the vitamin as well. As soon as I took them, they'd come straight back up, and some days I had to just go without. I'm 32 weeks now and baby isn't showing any ill-effects, but that could easily be down to luck!
Are you managing to eat anything? Because folic acid is found in many foods as well as tablets, so perhaps try to eat some folic acid-rich stuff if you're very worried (and can manage it!).
I do find it easier on my (pathetic) gag reflex to take tablets with something thicker than water, such as a yoghurt or milk drink, though I imagine that's the last thing you want to be drinking right now!
Hello, the neural tube is actually closed by around the end of week 7 of pregnancy, so at your stage of pregnancy you no longer need folic acid to reduce the risk of spina bifida and other neural tube defects. Hope you are feeling better soon.