I am 17 weeks pregnant and have been experiencing rapid heart rate, feels like at points its a little harder to breath, dizziness, blurred vision, nausea, fatigue and I have gone in multiple times and really don t get answers. The only thing they said it was is sinus tacardia and put me on a calcium channel blocker and it helped for a little while but now when the stmptomc occurred they are worse than before please help