Ned Fulmer never imagined he'd be living out his current journey with multiple sclerosis (MS). "Being in the hospital bed, there were moments where I thought I would never be able to walk again and not be able to experience those things," Fulmer, 38, exclusively told Us Weekly ahead of the release of his Sunday, November 23, YouTube video, revealing his MS diagnosis. "I didn't have children at that point, but it was certainly something that I wanted in life. And you know, I think it just makes me take nothing for granted." Fulmer was diagnosed with MS in 2013. "It started just by numbness and tingling in my hands that spread to my arms and chest and back," he explained to Us. Ned Fulmer, Christina Applegate and More Stars Battling Multiple Sclerosis Fulmer sought out medical care from a doctor and was told to return if his symptoms progressed. He later went to the hospital for an MRI when "it started spreading" to his chest and back, adding that he woke up one day and didn't have "the strength to stand up or walk." "It was completely overwhelming and sudden," he continued. "I mean, I was an able-bodied person that could run and play sports and was very physically active, and all of a sudden having weakness to the point of being able to move my legs one way but not another way was shocking." Though Fulmer said the treatments he received were "amazing," he added that they were also "pretty extreme," including steroid injections and a plasma exchange. Alberto E. Rodriguez/Getty Images "Over time, I started to get better. And then one day, I realized I could move my legs back and forth again, and it felt like a miracle," he said. "By the time a year later, it was sort of a relief to just have that clarity." Fulmer now takes an oral medication twice a day, which is "much more tolerable" than the injectables. "The ongoing sensory symptoms are like numbness and tingling in my fingers that are fortunately at a low enough level that pretty much, I'm able to ignore them," he said. "It'll kind of flare up every once in a while with hot weather or cold weather or alcohol or stress or lack of sleep. Those are all things that I try to stay on top of. And I'm sure a lot of other people that have MS can relate to that." Eric Dane Reveals He Only Has '1 Functioning Arm' Amid ALS Battle Fulmer added that his symptoms are "stable for the moment," which makes him able to participate in activities with his two sons, Wesley, 7, and Finn, 4, like playing in a bounce house and competing in backyard soccer and football games. (Ned shares his kids with wife Ariel Fulmer, whom he confirmed his separation from in September after having an extramarital affair.) In his YouTube video, Ned sets off to walk as many miles as he can in support of the National MS Society. For every 10 miles he walks, he donates $1,000 to the organization. He also encourages other creators to join the challenge and beat his record. Ned's goal is ultimately to raise awareness for MS and "inspire others to keep going." "You never know what someone might be suffering from silently on the inside," he told Us. "My heart goes out to people that are affected by this or any other kind of more silent disease because it's just a lot of fear that people carry, that I've carried."