I don't think your BP meds would do this. I too had HP, around 150/90 and started taking Benicar HCt 40/12.5, pretty much the same med you are on. My BP now runs 110/70, in fact it dropped almost immediately upon starting the meds with no side effects. Your BP has dropped considerably, but at 130 systolic you are still in the pre-hypertensive range and not yet down to a normal rate of 120/80 so I would not think your BP is doing this to you. Also, if you are using an eectronic monitor, make sure to take it with you to you next doctor appointment to have it checked for accuracy. Some models are prone to understate BP. I use a Omron HEM637 which is a wrist monitor with a built in snesor to make sure it is positioned right, if not it won't take a reading and it has been accurate everytime I have it checked by my doctor or cardiologist.
You really should run this by your dcotor to be safe, but I don't think it's because your BP has dropped.
Thanks for your response!