Jason DaSilva was 25 years old and a rising independent filmmaker when a diagnosis of multiple sclerosis changed everything — and inspired him to make another film. “When I Walk” is a candid and brave chronicle of one young man’s struggle to adapt to the harsh realities of M.S. while holding on to his personal and creative life. With his body growing weaker, DaSilva’s spirits, and his film, get a boost from his mother’s tough love and the support of Alice Cook, who becomes his wife and filmmaking partner. The result is a life-affirming documentary filled with unexpected moments of joy and humor. Official Selection of the 2013 Sundance Film Festival. A co-production of ITVS .