Needs some advice

Alrighty y'all I'm back here again and really want to try keto again and give it the best shot. I have in the previously tried keto probably a dozen times and always crash and feel like shit. Seems like I have a good 2-3 days feeling very sharp on it and than it just hits me where I get dizzy spells, insomnia, and feel pretty on edge(temporary increase in cortisol probably) and when I reintroduce carbs it literally makes me feels better. Now I know getting fat adapted can take a longer period for people but normally how long does it take? I am not overweight and am a regular weight lifter, and I do intermentant fasting pretty much everyday(eat 2-8 normally) Any tips in initially getting fat adapted and how long it normally takes?