Weird feelings on and off! ?

I'm in my 32nd week of pregnancy, I've had my glucose test done 2x now and it is coming back fine and normal....although the last few days or so I'm feeling odd from time to time. I sometimes feel like my heart is going to beat right out of my chest, almost like an anxiety attack, then I get dizzy but NO heavy breathing @ all...I feel like somethings are in slow motion and I lose my balance some when I'm feeling this way. I just don't feel "myself" so to speak. Has anyone had this happen to them during pregnancy or know what I can do to make it better? MY midwife said to eat more food that turns into sugar, which I've done but it's not really helping b/c I'm still felling this way on and off again! Any advice would help please! Thank you!