How to Fix “Google Now Not Showing Cards”

Been happening to me the last week, a few times a day . I've tried both solutions but they only work temporarily. I'm on a nexus 6 with Marshmallow.

I accidentally swiped one of my stocks to the left (trying to get back to the home screen), and it removed it from the list. The stock is still showing in my Stock Cards as one I'd like to view, but it doesn't show up in the card list anymore with quotes.

How do I get it back? I've tried removing it from the list and adding it back, no luck there, still doesn't appear on the card.

However, one stock that I Googled, but didn't add to my cards does show up. At least I now know how to remove it.

Did not work, however, I went into settings, now cards, and delete card preferences, pop up says this will delete across all you devices, hit ok.  Now cards gone from phone. Back to google search and set up again.  All cards back.

@JoseSanMartinIII

Thanks for your comment

I've been trying this. It keeps telling me it can't due to network error. This happens on Wi-Fi or mobile network. I just factory reset my phone and get the same result. Any idea?

If anyone reading this can help I would be grateful. I'm sick and pretty much bed ridden for the last few years and all I do is read. And watch tv. Grey's anatomy reruns aren't keeping me mentally stimulated. The cards are super helpful in reading current events I'm interested in.

Please please please somebody help me figure this out. Google forums and request for help have not even been answered!