"I went from being an outspoken, multitasking social butterfly to being trapped in a mentally paralyzed cocoon," Foster said at a 2013 event to raise awareness for Lyme disease.
Joining her in her struggle are her two children, son Anwar, and daughter, supermodel Bella Hadid. The reality star revealed they, too, have struggled in silence with Lyme disease for nearly three years.
At the Global Lyme Alliance Gala where Foster received the "Power of One" award, she dedicated it to her children, saying, "This is my token and my promise to you that I will not allow you to live a life of pain and suffering. I will walk to the end of the earth to find a cure so that you can live a healthy life that you deserve."
"These are all of the pills that I take. This is one day of just my vitamins. It's such a lonely disease and it's so silent," Foster told ABC.
"This is what they do to a lot of people that have Lyme disease. They don't have an answer for them, so they tell them, 'You're crazy,'" Lavigne explained to ABC.
This video includes images from Getty Images.