Aloysius: my first reaction was WHOA! CALM DOWN! My doctor told me the lower your BP the better, as long as you don't pass out and can still function. I did a search on Vagul Vega and couldn't find anything.
You are under a doctors care and are taking meds. All OK. Keep in mind that BP changes from day to day and moment to moment. The fact that you lost so much weight also may be a reason why your BP is lower.
I suggest you get a BP monitor, if you haven't got one, and check your BP once a day at random times. Don't obsess over any one reading, though. If you get what you think is an abnormal reading, check it again in 5-10 minutes.
And don't worry: that will kill you more effectively than low BP.
God bless and may He give good health.