That is actually a natural progression for a lot of people in our field. I, personally, don't want to be a developer when I am 35, and I am already being tasked with more and more of the duties of the roles I mentioned above, and I like it. Have you been tasked with of the duties of other roles that are less development-oriented? Did you like it?
If your sole reason for wanting to switch really is your health issues, find out what professions leverage your previous technical knowledge, and further refine that list depending on which roles will work with your health issues. On a side note, it seems that most professional careers these days require that you sit a computer for long periods of times: lawyers, engineers of all fields, accountants, and finance professionals, etc. So keep that in mind.
Ultimately, you get one body, so make your health your first priority. And you only get one life so make sure you're doing what you want to do. Good luck.