Hey Bro,
With your job, id reccomend BCAA's, such as
ICE by Xtreme Formulations, and some HMB powder (search the net), these should help prevent muscle wasting with your job. I'd also try to make it so you can snack throughout the day, preferably real food, but protein bars are a decent substitute.
Don't worry about the whole x grams of protein, just try to eat a couple chicken breasts or eggs a day, with whey protein after a workout and that will be fine, big thing is try to get a lot of calories, especially if you burn a lot.
Keep adding the fruit, it's amazing for overall health, i go through bags of frozen berries in shakes like its going out of style.
Glutamine isnt that great, it's muscle building properties are slim to nil, but its good for the immune system, which may help you. If you can afford it, keep it, if not, no big loss.