@Charris, I agree that you should see a neurologist ASAP.
I have low blood pressure and low blood sugar which results in fainting, for which my PCP has me drinking 4 bottles of real strength Gatorade a day. This has actually proven successful in keeping me conscious. I do NOT have any issues lifting my legs (despite the fact they are heavy/swollen), nor have I become dead weight, nor do I need a walker. These three additional symptoms you are experiencing are not associated with basic old-fashioned fainting spells. These need to be reviewed and addressed ASAP by someone who has a specialized understanding brain and nervous system.
Please, please, please go to a neuro! Sure, also go to hemo, endo - but neuro is key!
When I got weak after the DS dr K had me drinking Gatorade but I believe it was the lower sugar.