In an exclusive clip obtained by PEOPLE, Arnold – who overcame a rare cancer last year – forces herself to stay steady as her husband, 40, prepares for a spine surgery that could potentially paralyze him.
“I think I’m just going to go into my survival mode,” says Arnold, 40, who dissolved into sobs during Klein’s previous surgery. “[Even though] inside, I felt like just losing my mind.”
“It’s almost like it’s too hard to cry,” she explains, “This year has been so much that I feel like I can’t even allow myself to break down. All you can do is just keep going until you can’t go anymore.”
The Little Couple wraps its seventh season Tuesday night at 9 p.m. ET on TLC.