Low blood pressure

Anyone had low pressure? Or from how you felt assumed it was Low? I've felt off all day today. Haven't ate much and when I did eat, I threw up. Had a headache early today but that cleared up. Now I'm seeing spots..anyone experience this and what your ob wanted you to do? I'm probably going to end up calling because I'm not real sure what to do. Trying to eat some grapes and Apple slices to see if it helps.