You seem to have an unusually sensible diabetes nurse! Your body has been used to high sugar levels for some time, so a sudden drop is making you feel a bit odd. One name for it is a "false hypo" and there is also "low carb flu". It's all about getting used to change. As Nursie says, carry on.
There is no such thing as too little carb, but zero carb is really very difficult to do. We have between 20g and 35g each day. Higher levels are usually caused by chick peas, which are a favourite in this household. Find a level that suits you, a level that will keep your blood sugars to a level you find acceptable.
Do watch the gliclizide. This can push blood sugar levels too low and you may need to cut down or drop this as your low carb diet takes affect. Speak to Nursie, she sounds sensible.
Lunch: I make up batches of home made soup (so I know what's in it) and this just goes from freezer to microwave. We also have leftovers, salad (grabbed out of a bag) and cheese or cold cuts or tinned fish. Lunch is just about reaching into the fridge and dumping a few things on a plate.
Sally