Please someone i need some advice.. Since its ...

Please someone i need some advice.. Since its been cold we've had the heater on and ive just started to become dizzy and vomiting. Im currently 38 weeks pregnant and i dont know if its a worrying thing. It started yesterday and i was lucky that my partner was home but today im not so lucky cos he's gone back to work. I was fine yesterday afternoon after i had a bit of a nap. But today im not so much dizzy but im more vomiting cos i cant seem to keep anything down. I dont feel hungry but im trying to eat dry biccys (saladas) and water. but i cant seem to keep them down. Im debating to go to the hospital but i dont want to go there and wait for hours and hours then they send me home. Is this apart of the 3rd trimester? Baby is moving well so im not worried there. Im more worried about my nearly 2 year old and not taking care of her. I wish my partner could take time off but he's just got full time and we need him to take the days off when the baby is born. (even tho he's got no annual leave up his sleeve as of yet). Im just thinking of waiting for my midwife appointment on saturday but i dunno if i can put up with this again (as i had it in the first trimester) Please i need some advice.