Gabapentin question

Hey ladies I wanted to see if anyone else had this issue. I'm taking 300 mg 2 pills 3x a day. I've told my doctor last time when I was at 300mg 1 pill 3x a day that I've been having high blood pressure. He still upped me due to back issues. I will randomly get floaty then my heart will race and my hands will shake. (Not bad but it's my first thing I notice other then being floaty) I'm literally at work and it's been over an hour and I'm still shaky, floaty, and heart racing. (I'm worried if I take my blood pressure and someone at work sees it I'll be admitted since I work in a hospital.) Has anyone else delt with this? Posted pics of my blood pressure I've taken at home