It's called determination, mate.

Hey bro. Not Malacca GH. Working in good old KL. I take MRP's, sure they're expensive but they help a bunch and imo, definitely worth it for people of our profession who have absolutely no time to prepare a proper meal much less have a seat and take our time eating it even if we're dedicated enough to prepare it the day before. I head straight to gym right after work, workouts take around 50 mins to an hour and 15 mins. Remember what Lee Haney (former 8 time Mr Olympia) says: Stimulate don't annihilate.
I love the sport of bodybuilding, it's not something done on the side, when we're doing our best to get that extra shake or MRP in during work or on call, we're still bodybuilding. My advantage is that I don't like to go clubbing anymore, nor have any other time consuming hobbies except the occasional computer gaming. And I'm crazy enough to still hit the gym post call (sometimes less than 2-3 hours sleep the night before), which is why preworkout booster for me are a must. I don't really recommend you hitting the gym post call if you really can't, don't be afraid to take a day off after on call, I sometimes train a bodypart every 8-10 days because of my schedule because even I can't keep training post call all the time. And believe me when you ask members like pedro who meet me regularly, I AM still getting improvements on my physique everytime he sees me.
Focus your supplementation towards recovery. Recovery is of UTMOST IMPORTANCE when you're a bodybuilding doctor. I hope that helps man. Feel free to ask anytime if you need more details. 
=( I'm all too familiar with that shitty routine.
Lol... yeah.

They key is not to go over 5 hours without protein. It's simple. I have breakfast, then lunch at work, then 2 hours before i know i'll train, I take an MRP shake, then train, after that dinner and a protein shake before bed. =) And if you're on call.... as usual breakfast and a pseudo pre bedtime shake around 12 plus (pseudo cos I know it's not really bedtime on call since the b**** ass nurses won't let us sleep), then an MRP or 1-2 scoops of protein blend around 2-4 am. Then your breakfast again before you start morning rounds.
If on call, I pack the post call breakfast the day before. 4 scoops of oats (use the scoop which they supply with your whey protein) and 2 scoops of protein blend into a zipper bag. In the morning mix with water and shake and drink. Lol.... my bag i bring to work is HUGE!

Nah, I'd be a fool to think I'm better than a surgeon. It's all basics and common sense actually mate. People tend to overcomplicate things. Bodybuilding = recovery = bodybuilding. Food + rest + training + time + more rest + genetics = growth.

Don't EVER design a fixed schedule based on days eg. Monday Chest Tuesday Legs and so on. We doctors can't do that shit because of shitty on calls. We need a lot more rest days. I sometimes train a bodypart every 10 days and you'd be surprised, the extra rest makes you grow more.

And no I will not go into surgery. Lol. I'm eyeing sports med or ophthalmology. The concepts of phacoemulsification fascinates me.

Dude you going through your internship now? Completing I guess? How's life? UMMC if I m not mistaken?