Horrible realistic nightmares

This is my 5th pregnancy. I have had some sort of this type of dreaming for each but for this pregnancy it has been extremely real and every night! I thought maybe it was the zofran mixed with normal pregnancy hormones but I stopped taking Zofran daily about 2 weeks ago and they have gotten more frequent! These dreams are so intense and real I sometimes wake up crying or with an extremely fast heart rate and it takes me a little to snap back to reality. It wouldn't bother me so much if these were HAPPY positive dreams but these are my subconscious fears playing right out in extreme detail. I'm no more stressed than the usual and no big life changes. Any mommas can relate?