I would say bone broth. Search and you will find lots. (I'm not an expert on it.)
Are you able to get sunshine? You must get enough vitamin D3. Get tested if you can. You may need to take some capsules. And get enough A and K to make the D work.
Are you doing any intervals (sprints) in your swim class? (Everyone can do sprints. Just go as fast as you can for 30 seconds, even if that is one mile an hour.)
Good luck. I hope primal works great for you!!!