Re: Ultrasound Tech or medical job with least physical labor? *
You'd mentioned ultrasound technician (which is now referred to as a "diagnostic medical sonographer"), there are *not* supposed to be too many jobs these days including for radiologic technologists (which used to be referred to as x-ray technician). Regarding nursing, please be aware that even though some jobs may be less physically strenuous, the students must get through their clinicals which involves lifting, moving and transferring patients and a lot of standing and physical activity.
How about talking with a vocational rehab counselor at the local county vocational rehabilitation center. Perhaps you can go through an interest checklist regarding your strengths and interests and narrow down the career opportunities. (Just fyi that there are a lot of tv commercials on tv for medical billing & coding and medical assistant, and, unfortunately, the jobs are very scarce with that field, too. The field is saturated.)
This government site has general career information: http://www.bls.gov/oco and can type into search for whatever career that piques one's interest.