Suggest Remedy For Sudden Dizziness And Vertigo

Question : This a.m. I did a full body stretch in bed & whilst doing so, turned over to the right. Something felt "off" like I stretched too far, so I stopped. I then started to get up & had the shock of finding the whole room spin & spin - it was so terrifying. After lying down for a few mins I tried to sit up, & again the room spun. So I took 2.5 of my alprazolam to relax (calm the panic really) & aftter a few mins. I tried to sit up again. This time it worked. I went back to lying down whilst I considered what to do next & w/out thingking, I turned over to the right again & bam, the room spun out of control. I am wondering if it is a pinched nerve? I am now up & was able to walk over to my computer, but was v careful not to look to the right. Btw, the only similar thing to happen to me, was about 10 yrs ago when I had spent a full day raking leaves - I woke up & when I tried to raise my head, there was severe dizziness. That time my husband drove me to ER & they prescribed muscle relaxants. I *do* have cervical erosion from a neck injury resulting from lifting a patient back when I was a nurse in the mid-70s. I am female, 62 yrs old. Thank-you for your help.