LOL
Well, Matheous....you are taking Amlodipine in order to lower your BP and by the sounds of things has done a pretty good and essential job.
The studies of Arginine are not at all impressive in it's effect on lowering the BP.
So.........why change? If one did for a short period of time "wander off the beaten track" then I could see no harm, at least it would get it out of your system.
P.S you would never forgive yourself if you had a stroke during this "experimental" time of your life.