Though no fault of your own, the injury you sustained on active service - and, moreover, IN DEFENCE OF THE REALM - has evidently left you at least partially *disabled [even though you don't regard yourself as *such]. I can think of few (if any) more honourable testaments to an ex-army man's sense of loyalty to his comrades. In the circumstances, and from the information you've shared here, I cannot imagine an Entry Clearance Officer refusing to grant a spouse visa - especially since your financial situation indicates you will have more than adequate resources [without working] to provide for your wife and child. I think you can safely rely on the reassurance given to you by Citizens Advice, together with your GP's letter of support.
Best of luck mate.
