Two Days Ago I Got Out Of Bed And Was

Two days ago I got out of bed and was very dizzy. It continued through yesterday. This morning it was gone when I woke up but started again in the afternoon. I am only dizzy when standing or walking. However, it is constant and nearly causes me to fall. I have no fever, headache, or nausea. I am 65 yr old and in good health. I take metoprolol 25mg daily. 3 days ago My blood pressure was 120/68. Any suggestions as to the cause or what I should do before seeing my family physician?