Your surgeon is probably great with the scapel but an idiot with nutrition. It's not his fault....they don't teach nutrition in med school these days. 1200 cals at 1 month out?
This is the typical "3 week stall" that nearly EVERYONE goes through some point in their first two months. Do an OH search.....might be the most talked about topic on here.
Now normally I would say.....stick to what your doc and program say to do but since he doesn't seem to know what he is talking about...I would tell you this:
Make sure you are getting adequate protein. Not sure if you can get your 60-80g per day at this point yet or not....if you can't....make that your #1 goal.
Drink, drink, drink.....you need to be hydrated.
Don't worry about having too few calories. I would say 400-500 is normal right now if not a bit high.
Be consistent in your efforts and approach. Do not freak out over stalls. This is a marathon not a sprint. If you can verify that you are eating correctly (you are journaling?) then this is just your body adjusting. You can do it and don't need to make any radical changes.