Best wishes for a speedy recovery. I have not been through anything as serious as that. A friend of mine has being getting some "heavy duty" treatments over the past two years. Right after her treatments, she is too tired and weak for riding. But, in a week or so, she enjoys shorter, slower rider.
And, now that her treatment has been successful, she is getting back her normal energy and riding and exercising more, and enjoying it more. And, that's where you can be when your treatments are over. Again, stick with it, and get well.