I know now that it is nectarine leaf curl...is there anything I can do for it?

Aside from any type of conventional sprays etc?

Yup, peach leaf curl. Remove and dispose (Burn) all of the effected leaves if possible. I think you may be too late for sprays this year but can go after it earlier next year.

I don't spray for PLC, just pick the leaves off as I see them and dispose of. Easy to do unless you have an orchard full of peach/nec trees. We're having a nice wet spring so more PLC this year (judging by your sweatshirts you are in San Jose too :) ). PLC doesn't effect the fruit but if the fungus takes all your leaves it can hurt the growth of the tree. I know people with mature peach trees who just let the curl happen and still get excellent fruit every year.