Going for a 68h new fast is not the wisest choice after feeling like crap during a fast about half the length.I suggest that you start slow with OMAD, which will result in 23h fasts if you have your meal at around the same time every day, then evaluate from there. Depending on your diet, that alone will be enough for you to notice a difference over time: time-restricted feeding means no more guilty snacking late in the evening, no more sugary foods on breakfast, no more entire afternoons drinking tons of alchool, etc., which helps not only with weight loss but boosts well-being overall.
If you feel that bad today, I would strongly suggest taking a break for a few days before you embark on another fast. Atleast wait till you feel better and start small. You don’t want to have such a miserable experience that it turns you off fasting forever. Also, what do you mean liquid fast? Are you having juices and stuff? Or just water?