In constant ketosis but experiencing extreme 'carb starved' feeling in 2nd week despite great 1st week.

Hey there. 2 weeks ago I brought my carbs down to around 20g and after 3 terrible days I felt a sudden shift (slight euphoria, mental clarity, energy) and that built each day for about 5 days. There's no doubt I was experiencing the effects of ketosis. Extreme appetite reduction (often to the point of nausea), great energy, clarity, etc. The whole time I've been frequently checking my blood and my ketones are always around 1.5-3.5mml. Never once seen it below 1.5. 3 days ago I suddenly started feeling extremely 'carb starved' again. Cranky, light headed, cognitively impaired, physically lethargic. Is this common for this to have happened? My blood ketones are still high but it's like my body and brain said 'we don't wanna use them any more. gimme that glucose back'. I've been taking heaps of salt, magnesium, potassium, water. Thoughts? Seems strange after my body and brain seemed to love using ketones days 3-8. My urine sticks are also showing a high reading which makes sense as my body certainly doesn't seem to be using the ketones.