Feeling strange.. is this normal ?

So I randomly woke up around 2 am. I had a weird feeling . Id describe it as a blood rush threw my whole body followed by a tingly sensation threw my whole body. And i noticed my heart was beatin really hard. I could hear it and feel it in my head, neck arms, chest. . This went on for a hour. It would happen about 3-5 minutes apart.. i got up to use the restroom and i got so lightheaded my boyfriend got up to help me ... so right before bed i kept telling my boyfriend that i felt really shaky. I put up my hand and hes like yea i can see ur fingers shaking. Is this normal ? I read our blood doubles when pregnant. But i havent read anything about this happening during pregnancy.