When you start the feeding routine with Oz the MOST important thing to do is to ignore Oz. Sounds odd, I know and especially when for decades the emphasis has been on controlling the dog at feeding times.
As long as you are not looking at, talking to or holding on to Oz it really doesn't matter where he is.
Totally ignore him all the time you are putting his food in his bowl and your food on your plate. Totally ignore him as you eat the little bit of food you have and clear away the plate. What Oz is seeing and probably getting excited about is that it is food time but things have changed!! He is no longer the focus of attention....suddenly the FOOD is! The very fact that you are concentrating on food and not the lower ranking member of the pack says a LOT to the dog about your ability as a leader and your confidence and therefore his safety and how secure he is.
When you are ready, do not rush - no matter how frantic the dog gets - call ,"Oz." ( He is probably jumping up and down in front of your face....but you haven't noticed him!!!!!) Pick the bowl off the work top and ask for a sit if you like or simply put the bowl on the floor and walk away.
He may decide after a while that he is going to ignore the food prep time.....that is great! It does not mean that he doesn't know what is going on - just that he is willing to wait for his turn and that makes you a good leader!
All areas of seperation anxiety and control behaviour will reduce quicker than you would of believed if you can feed and follow the ignore rule when you come into a room where the dog is.
The first day is the hardest and it is exceptionally hard without support from a person (me) actually in your home with you for the first couple of hours.
If you can do it I promise you the results are worth the effort....you have to adjust your thinking a little to think dog.