Getting supply back

I went out of town for a “kid free” wedding and did a terrible job keeping up with pumping. My little girl is 8 months old today. My supply has entirely gone out the window. I’ve been power pumping the last 2 days since I’ve been back and it doesn’t seem to be getting any better. Is it going to come back or should I just give up? I am heartbroken and don’t know what to do. She won’t hardly latch because nothing is coming out so pumping is my only option