I Am A 47 Yr Old Woman. In The Past

I am a 47 yr old woman. In the past 3 weeks, if I lay on my stomach and lift up my head and upper body onto my elbows, my hearing changes and I feel like I have tunnel vision and am on the verge of passing out. This is not a new position for me...however the symptoms are new. I quickly lay back down or turn over to stop the symptoms.