On my site orders are coming through correctly (not using paypay) but customers are not getting confirmation emails. It might be a good idea to ask your costumers if they have received them. If they haven’t you can send them automatically through the order screen.
It might be best to revert back to an older version of woocommerce (2.X.X). There seem to be all kinds of bugs with 3.x.x so your not missing out on anything.
After you click on edit product and go to the edit screen, can you type text, change settings and images? I can go to the product editor but the publish/update button doesn’t do anything. When I click on preview the product starts saving but freezes.
