Hiya, I also am not a nurse, but I'm a medical student coming to the end of my studies.
As Spireite has said - everyone with HMS is affected differently, so I would say the only way to know for sure is to try it and see.
I find that medicine suits me quite well because it is a mixture of moving around and office work, both of which cause problems if I do too much of them, but seem to balance each other out quite well.
Make sure and apply for Disabled Students Allowance if you can - they will be able to give you equipment that you need (a posturally supportive desk chair for example) and money for things like printing and taxis if you need them.
I hope it works out well for you
"Have faith" "I do. I also have fear, and a propensity to bruising." (H2G2)
Dx HMS in Jan 2011 by local rheumy, mum dx HEDS in Oct 2011 by Prof G. Dysautonomia with features of POTS, delayed gastric emptying, asthma.