The wife (retired RN and cardiac pro on her third pacemaker and a veteran of just about every heart med ever made) says it could be a reaction to the Losartan, even though you've been taking it for awhile. Her doctor just took her off of it because he said there's been a recall. She doesn't know the details, she just stopped taking it.
Something you can do right away is when you get up, get up slowly. If in a prone position, don't go to standing right away. Rest a bit in a sitting position before standing up. Do it slowly in stages.
I'll send you the bill at the end of the month.