Huge changes

ambie35

I have been a sedentary student -well my life up to this point really. However for the next 5 weeks I will be out on job term and then starting my career. It will be quite physically demanding as I am training to me a nursing assistant and will be helping clients who will most likely be much bigger then me (Im 5 ft 3 and 115 lbs) with walking,dressing,eating and other personal care .A lot of getting up and back down,lifting and pulling etc. All my shifts will be 12 hrs.
Also I am zeroing in on my goal weight-like will hopefully reach it in the next two weeks.
So my questions are:
1.how should I log my new "job" change my lifestyle setting,or log it under exercise?
2.what are some ways of dealing with the new found calorie allotment (maintence calories + highly demanding job allotment)
I don't to gain all the weight back I have worked so hard to drop.
3. Any other 12 hr shift workers have some advice ( ie,logging food on night shift,healthy packed food etc)?