I Started Feeling Dizzy Last Night After I Layer Down

I started feeling dizzy last night after I layer down for bed. I was lying on my back then turned to my left side when I felt the entire room turn. I freaked out so I layer on my back. After that everytime I turned I felt very dizzy and it hasn't gone away. My husband took me to the ER and I got checked out, everything was fine.. My blood and my ekg was fine. I was given meclizibe , diazapam and some iv fluids. I came home and fell right to sleep. This morning when I woke up again I got dizzy again.. I am not anemic or diabetic. I've had a miscarriage back in 2012 & during that time I fell after my dnc in the recovery room and found out two weeks later I had a slipped disc in my back. Pain got worst and ended up getting 18-19 injections in my back. Since then I felt the uncomfortable feeling traveled up my back. I do suffer fem migraines though. I am also just recovering from my monthy cycle and I didn't bleed heavily... What could be wrong with me, I am very worried...please help me.