Teddi Mellencamp is opening up about her slow realization that she was suffering from brain tumors … and she says she’s had some of the saddest and darkest days since her diagnosis.

The reality TV star dished on the “wild” lead-up to her brain surgery on her “Two Ts in a Pod” podcast, explaining she initially dismissed her symptoms as migraines or menopause.

Teddi says she was at a horse show when she had a terrible migraine, took some of her friend’s migraine meds and instantly felt worse … to the point where she forgot where she was.

As we reported … Teddi had 4 tumors removed from her brain earlier this month, but doctors recently discovered more tumors … including two in her lungs.

John Feinstein — a longtime sports reporter and author — has died at the age of 69 … according to his employer, the Washington Post.

John’s brother — Robert — confirmed his passing to the outlet on Thursday. His cause of death was not revealed.

Feinstein started his career at the Post in 1977 … working as a night police reporter before joining the sports beat. He was the author of 48 books, 23 of which became a New York Times best seller. One of his most well-known pieces was “A Season on the Brink,” which followed the 1985-86 Indiana University men’s basketball team led by Bob Knight.

He had a column published Thursday morning by the Post … which was about Michigan State head coach Tom Izzo.

Many media members, along with readers of his work, have taken to social media to comment on his passing.

He was 69.

Gabby Windey says she hasn’t seen a dime from the prize money she won on “Traitors” … but there’s a paperwork issue holding up the payment and Gabby doesn’t seem to be sweating it.

We got the reality TV star at LAX and our photog asked her about her claim that NBC has not paid her the $40,860 she won on the show.

Gabby tells us she still hasn’t been paid since first raising the issue on “Watch What Happens Live” when she told Andy Cohen about it … and she’s hoping the deposit comes soon.

We’re told Gabby’s agent hasn’t submitted paperwork with her bank account routing number … and ya gotta see her reaction when we confronted her with that fact.