I think the current situation is that Nacho poisoned Hector to stop him from taking over his dad's shop.
Gus figured it out and now has Nacho in a bind and is forced to work for him.
Gus' goons took him to the desert and shot him up along with his dead partner to make it look like they got jacked by a rival dealer.
Hector's cartel family links came across the border to rescue Nacho, that's the two brothers. Who are helping Nacho, because Nacho used to be Hector's no. 2, so they trust him.
Nacho told the brothers a porkey, that it was this rival gang that got him shot up, so they go find them and blast them. Essentially wiping out some of the competition, making room for Gus to then move into that territory.
And now Nacho is stuck working for Gus unless he can figure out a way of getting out of that situation.
This episode was really good though, I enjoyed it. And we can see now how it looks like Jimmy is going to start becoming like the Vet and make his own network of criminals through the burner phone business as part of his progression into Saul Goodman - hence all the phones in his drawers in BB.