Ay, 14 weeks is still very much in the thick of it, a few of us mums went through the same thing and it's quite draining lah! Try drinking more water (seriously, dehydration makes it worse), rest your head on a cool pillow, and eat smaller meals so the nausea doesn't spike at night. But since it's happening every single night and affecting you so much, best you check with your doc to rule out anything else and maybe they can suggest something safe for pregnancy, sometimes they can help manage it better. Hang in there, should get better soon!