Ambidextirity, core strength and injections.

[HerbM]

Most/some of your questions have already been answered but I will chime in with a few ideas:

1) There is a good recent discussion "Question About Southpaws" in THIS FORUM. Some people were helping another guy and myself think through the idea and methods of switching:

http://www.saddoboxing.com/boxingfor...uthpaws-1.html

2) Much of your power comes from your feet, legs, hips, and core (usually twisting) or even from weight transfer (but this last especially must be done correctly to avoid going off balance or exposing yourself to increased risk.)

IMO, your arms are mostly about SPEED, your body and legs about power -- when you coordinate the two you have fast powerful boxing.
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3) If you are under medical care you DEFINITELY should ask your doctor for competent medical advice about training and what precautions you must/should take. If you don't have an appointment then call his/her office and ask to speak to the doc or even to the nurse who assists your doc. They can get you a proper answer.

It sounds unlikely that merely taking injections would matter (as opposed to the underlying condition) but I don't even play a doctor on TV so ask your doc.