overeating

You will fat adapt , Are your cloths looser? What are your drinking ?

If it is an effort to go upstairs that is ascension weakness - as described by Dr Atkins way back in the last century - he advised a small amount of salad or low carb veges be added - about 5 gm of carb, until things improve. I think it was advised to make the increases every other day - so as to give time to assess the benefit. Once the weak feeling goes then you can settle on the amount of low carb foods you need.
I am rather astonished at the amount you are eating, and the number of meals each day - and that you need to add butter and snack on cheese.
There are carbs in the avocado and spinach, but it is hardly a full spectrum of vitamins and minerals - perhaps a supplement might help and perhaps a more varied diet. It does worry me a bit that you eat the same thing for every meal.