I currently work in IT, supporting medical scientists/researchers in the research department of a large teaching hospital in Canada.
In hospitals the major spending is on salaries and big equipment (MRI machines, for example). Post P.O. we'll see no new equipment bought, and a larger market in used and maintenance contracts. As the suppliers of equipment start going bankrupt, much the equipment will eventually become unusuable due to lack of parts. The big expensive equipment will go first.
This is similar to what has happened in Cuba. (See
Cuba: Life After Oil - PDF) for insight. Health professionals will be one profession that will stick around, just like farmers and skilled tradespeople.
There will always be a need for the caring professions. Nursing, counselling, and general practitioners will be the most important. I'm thinking that a Naturopathic Doctor would be an ideal certification to obtain soon. A N.D. -- like a general practitioner M.D., doesn't need big equipment and large infrastructure. If a four-year program in naturopathic medicine is too daunting, becoming a certified herbalist would be a secondary choice.
I'm thining of either naturopathy (expensive!) or herbalist training (cheap), as I have a chronic inflammatory arthritis that limits my ability for manual skilled labour. Does anyone have thoughts about begining an intensive education in naturopathy at this time?