question: I recently lost 30 lbs and my blood pressure was consistently 120/70. Now that I weigh less, my blood pressure is consistently 100/62 with a normal heart rate of 78-86.  Would dehydration cause sudden and short lived blood pressure drops?  I have been getting bouts of dizziness and almost feint for about 20 second and it doesn't matter whether I am sitting or standing.  I know you can get dizziness from getting up fast but that is not the case with mine.  I also suffer from arrythmias on occassion where I feel dizzy and feinty and my heart rate jumps to over 200bps.