ELLIE ~ yes, sure know how you feel, as someone who injured both of my knees; they have been slowly healing as I focused on light exercises (stretches, toning, flexes, Tai Chi, yoga, walking, etc); and my eating plan, which is so good that I could stay on it for life.
I eat healthy foods/dishes/snacks that we love, so I can stick with this long-term. If I make a mistake, I just keep on going: working on the next meal or snack, or day & week ... one small change AAT, one-step-at-a-time, one-day-at-a-time ...
This is a great place with wonderful people and lots of support; look around and jump right in wherever you like, and enjoy yourself here ...