Getting obsessed with walking and don't even want to sit for a minute, I need serious advise please?

On a daily basis I walk a bare minimum of 45k steps a day and I never sit even for a short second and now the step count is becoming worse, I’m an anorexic in recovery and I know doing this really slows down my weight gain, I want to gain weight fast but I really can’t get rid of the obsessive walking. I’ve read articles that sitting too long leads to muscle loss and weaknesses and I’m just scared of that. Please, any tips on how to get rid of these thoughts? I can’t continue doing this for long I’m so desperate for help I can’t do this on my own