Hello Rapscallion Cat!
I did feel AWFUL first time I did Exante, by day 4 and 5 I could hardly move. Not faint though. Drink plenty water (not too much though!) don't do very much, be kind to yourself, and see how you feel in 2 more days. Good luck xxx
You could try some high protein snacks if you are struggling, ie hard boiled eggs, chicken, ham etc and ensure that you stay hydrated and try not yo of too much especially in this weather xx