Inundated with Facebook pages, help if possible. [View all]

About a month ago, I was all over Facebook looking for cat food. All stores sold out near me with no hope of restocking soon. I have a fussy old cat who will eat only one flavor/one brand. I traveled all over the grocery stores in my area..no luck. Checked on line, starting with Chewy. "Not available". I kept looking, must have checked 20 sources, including eBay.
No luck.
I had about 15 cans on hand and was worried about future availability.
I must have clicked on some site that sold my name. I try to be careful and am a simple computer user. Never seen anything like this:

For the past 2 weeks, I have had..not kidding...several hundred sites appear on my page. I can't stand it. I hit "hide post" but that is useless. Is there a simple way to block these pages so I can get back to normal or am I stuck?
Thank heaven there is no porn but I bet I have heard or seen every Elvis, Johnny Cash, travel post etc from all over the world.
How --or can I-- block these pages or do I have to close my Facebook account and open under a new..maybe abbreviated name to get rid of this junk.

I have deliberately kept my friend list small and am careful not to click on ads. Finally, Chewy had the food available and I ordered 3 cases. All set for now. Cat is fine, I'm a basket case. Help if you can.
Thanks, PR