36 weeks dizzy/cramping

I'm 36 weeks and had to have my husband come get me from work bc I was so dizzy I couldn't drive. I'm a cosmetologist and was in the middle of doing a highlight on a client when I started to sweat and got tunnel vision. I grabbed a stool and sat while trying to hurry and finish up. My arms all of a sudden felt so heavy and I was getting dry mouth. I had to step away and grabbed a sprite and a cold wet rag and put it around my neck and went back out and was able to finish. I then went outside and sat down trying to cool off but the room kept spinning. I was able to get my clients service done and my husband showed up and took me home. My blood pressure and sugar were normal. What the heck is this about? I've never had this. Now I'm cramping. I'm not sure if these are related or not. Has this happened to anyone else? My next doctors appointment is Monday.