Welcome to HealthcareMagic forum.
The symptoms you have are suggestive of syncope
- a condition associated with drop in blood pressure. Usually these symptoms are transient and patients recover very soon. I am not sure how long your symptoms last. It would have been better if you had specified that.
Presuming these symptoms are short lived to recur again; many of these episodes are not concerning. However it warrants a complete cardiac evaluation - a detailed examination, EKG and 2D echocardiogram
You may consult a cardiologist
to stream line the aforementioned tests. We can comment more about the cause and treatment after the consult.
Hope this answers your query.
I wish you good health