Not Selling. Help

I went from selling ~300 units a month to 0 some days. Before I had an acquisition cost of only like $5 now I’m in the hole. When I started a new automatic ad campaign things worked out. When I tried to scale that campaign I went back to 0 sales. I have no idea what’s going on any more. I increased the bids for my manual keyword campaign and nothing is converting there either.

Is anyone else struggling?