With all these stress and nonsense, it's impossible for you to increase supply.. Can maintain already good enough..
Breastfeeding is always my first priority in motherhood.. If I'm you, I would 'send' the grandmother home, she of ears off from my mom's scolding, keep myself in the room, change another doctor to a pro-breastfeeding one, be it GP or pediatrician or gynae, stop pumping n latch on demand n sleep all I can afford to, eat as much as I can stomach, especially soups..
Try my best to relax my mind n reduce my stress..
Can your mom handle your girl for you so you can focus on yourself n your boy?
Poor thing you.. Really sound so stressed up by all these people around you..