I think consistency is good for HSP, so anything with a lot of interruptions, drama, or volatility would not be that comfortable.

My most fulfilling job was working as a camp counselor where I got to choose how I wanted to do my job and I had little supervision from my superiors. I also found it to be interesting, exciting, and fun everyday.

The jobs I've enjoyed have allowed me to work alongside others, but each have our own independent tasks to do. I think that being a nurse would be overwhelming. Emotionally, physically and mentally.

My best job was at a comics & games store; I got to deal
with geeks like me all day long, and people appreciated
my innane trivia - found it valuable, even.

As far as where you should head, I think it's highly situational;
either could be a good fit for you, in the right circumstance.

IT can be a great job fro HSPs, in the right environ, but it can also
be a job where you have to deal with a difficult person as a manager.
I worked IT for many, many years. Some were really great jobs,
some had difficult people as managers, and made what could have been
an otherwise nice job very difficult to cope with

Nursing could be the same way, in the right environ,
you would'nt have to worry about getting "drained";
but you might have to try more than one position to find your niche.

Nurses are everywhere, social work, children-centric positions,
postions in anaylisis clinics (pretty low key envoirn, normally)
(anaylisis clinics do testing of physical health, test blood, urine,
blood pressure, response, etc) positions in psych wards,
(not every psych ward is a volatile environ; there are many
"recovery" centers where things are purposely kept calm
and low key) foster homes, you could do paitient monitoring
as a regular nurse (there'd be some "dues" to pay first,
but a pretty calm environ normally)....

Then there's alternative medicine type things, usually pretty low-key,
nurturing, calm environs. chiropractic, nutritional, herbal....

There's alot of possibilities out there for you, and whatever you choose,
you could certainly work out the right environ for you - might take
a few tries, but you would have the skills and support you needed.