18wks weird metallic taste in mouth

So I'm at 18weeks now and I've been having this weird metallic taste in my mouth. Feeling very gassy and bloated. I tried eating sour candies and sweets but nothing works. It's a taste I can't get rid of and it's making me brush my tongue too often which in turns makes me want to vomit. 😩😩😩😩 Any advise?