What Causes Recurring Dizziness, Tremors In Hands And Legs And Blurred Vision?

I have had low blood pressure in the past but since having a child it hasn't been an issue. I used to pass out all the time, not just when standing up but even just sitting for long periods of time.
However as i stated this was awhile ago and only recently I have started to experience these symptoms again, but worse.
This morning when getting up I was up for a min or two and then all of a sudden got very dizzy and fell to my knees and was sort of twitching and shaking, with low vision for about 4 mins (I think, however can not be 100% sure). Then this afternoon I was on my computer sitting and then turned around to lay down and I got the dizziness and heavey headedness again, as well as my finger/hands twitching for 5mins after the head dizzyness stopped.
I have also had issues with pins and needles in my legs and arms/ hands in the last few months too. Not sure if this is connected.
So I guess im asking if this is normal and just the re-occurrence of my low blood pressure or should i get it checked out?
Thank you.
Cassandra McNeill