In regards to the nausea and fainting, try supplementing with salt before your workouts. A few grams, about 1/2 tsp is good. It's doubly important on a keto diet. You should notice a benefit immediately in your workout capacity.
[size=8pt]"For I reckon that the sufferings of this present time are not worthy to be compared with the glory which shall be revealed in us.”[/size] [size=7pt] - Romans 8:18[/size]