"#fbf to a very short bit ago. Day after #chemoday isn't always so great," she captioned the snap. "Sometimes one isn't able to dance, or eat or even to think about the next day. Sometimes it just feels like you aren't going to make it. That passes."
"Sometimes the next day or 2 days later or 6 but it passes and movement is possible. Hope is possible. Possibility is possible," she continued. "To my cancer family and everyone suffering.... stay courageous. Stay strong. Stay positive. #wegotthis. #fightlikeagirl."
ET caught up with Doherty at last month's Stand Up to Cancer telecast, where her oncologist, Dr. Lawrence Piro, revealed that she was "nearly finished" with chemotherapy -- an accomplishment Doherty says comes from the courage she's gained from her fans.
"I hope they take away the fact that you have to be strong and put yourself out there and have courage and be a warrior," she shared. "And for me, one of the most important things is for them, their messages, their stories, their love, their support has given me courage. And I thank them for that wholeheartedly."