On Monday, the Beverly Hills, 90210 alum shared a video from when she cut off all her brunette locks before undergoing treatment. In the video, she keeps positive as her friend shaves her head, exclaiming, "I look like Bart Simpson!"
"This day..... laughing thru the tears," Doherty captioned the video. "Thank you @annemkortright for jumping in and doing what needed to be done."
"The unknown is always the scariest part," Doherty added. "Is the chemo going to work? Is the radiation going to work? You know, am I going to have to go through this again, or am I going to get secondary cancer? Everything else is manageable. Pain is manageable, you know living without a breast is manageable, it's the worry of your future and how your future is going to affect the people that you love."