How to overcome injuries to become /fit/?

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Okay, so I have a number of health issues getting in my way of becoming fit: a boxer's fracture (tendonitis and wrist pain as a result, so this affects grip strength), flatfeet (shin splints and calf pain) and irritable bowel syndrome twinned with gastroesophageal reflux (lethargy, bloating and intestinal pain).

So basically, all of these, aside from the boxer's fracture weren't an issue to start with as I was younger and my body was more resilient.

I gained the boxer's fracture during a 'no holds barred' sparring session which became rather heated and resulted from an inaccurate temple strike.

Anyway, as I've become older, they have became an issue and the boxer's fracture (now that I'm nearing my mid-twenties) has started to become rather painful.

P.S: Martial arts isn't good for health, as a result my joints are screwed. It is good for discipline, reflexes; muscle memory and self-defence though (so long as you don't only concentrate on a single art without gaining a comprehensive knowledge of martial forms).

I've already made an appointment with the doctor for tomorrow, however, I'd like to know /fit/'s thought on how to abate them as a supplement to whatever treatment they'll give me.

My aim is to become physically capable again: lifting, martial arts; cardio, etc.

Any thoughts?