I'm trying to act now because it will be months before i see a specialist. I don't even think they've typed the letter yet!
I have lowered the carbs, starchy or otherwise (there doesn't seem much difference in terms of quality), as well as sugar.
Just cut out sugar, bread, rice, wheat products & non berry fruits except Avocado, I aim for under 20 grams of carbs for the whole day, the less the better.
Ketosis will kick in when your body sees there are no more carbs & sugars it will start to run in it's natural fat burning mode switching from carb fuels.
The state of Ketosis will also make brain fuel as part of the fat burning process so you will not miss anything from carbs.
This Keto Flu that is spoken of is just a quick adjustment not a dire dread, you sound like you think it's the plague, I have been doing this for 5 weeks now & I didn't even get it.
The fat in the things you are allowed to eat helps you stay full once Keto adaption occurs, for me it happened after about 3 days, I don't even feel like eating more than 1.5 meals a day.
I have lost a stone & a quarter so far, it works better than all other diets I have tried; I plan on sticking to this way of eating from this moment on.
Bread, cereals & Sugar is a racket & so is the Governments so called health Pyramid food guide which seems to be formulated to help food businesses & the sugar producers.
Do not Drink Fruit Juices They are not healthy & contain teaspoons of natural sugar also Don't drink Lager, Wine or Cider if you must Drink try spirits with diet mixers but ideally no Alcohol at all.