"I am worried about Caleb," she says in a confessional, before becoming emotional. "I think he'll let the depression set in before he hits rock bottom again and gets determined to come home. I feel guilty. I'm numb, I don't know how to feel—overwhelmed, stressed out, just everything."

For Tammy, putting on a brave face for her family—including sister Amy Slaton—remained her focus.

"I'm being strong for Caleb, Amy, the kids," she continued. "If I crumble right now, the whole world will go to hell. More than it already is."

In July, the 36-year-old shared that Caleb had passed away, remembering her husband as a "sweet angel."

"You will forever be missed and loved so much," she wrote in an Instagram post honoring the 40-year-old. "Thank you, Caleb for showing me real love and happiness."

In the months that have followed, Tammy has since shared personal updates on her health journey. Keep reading for a glimpse inside her ongoing progress.

1000-Lb. Sisters airs on Tuesdays at 9 p.m. on TLC.