Firstly Meghan, what a gorgeous little man Alex is, delicious! My heart goes out to you and i agree with the pp's that the first few weeks are the hardest.
By posting on this forum you have taken a big step forward in establishing a fantatstic bf relationship with ya little 'un.
It sounds like you have great support from your hubby and even though your Mum may be driving you up the wall at least she isnt going the other way and trying to push you towards formula. It must be frustrating though that she isnt acknowledging that it can be REALLY tricky to get this whole feeding thing down...
Is it at all possible for you to have a 'babymoon'? This is basically just hanging out with your baby 24/7, both naked in bed if possible, just snuggling and having some close and dreamy time to bond, and not just stressin about !!!!THE LATCH!!!!! If he starts to have positive associations with your breast he be will more likely to latch. And you sound like you could do with less stress!
Good luck anyway, dont beat yourself up about the formula thing, I have read so many stories about women who get off to a bad start and end up bf their babies successfully.