My first guess would be you may not be eating enough. It's something that's remarkably easy to do, and that's generally how I feel when I don't eat enough. Might be something else, but even if it is, my first questions would be what does your typical meal (or days worth of meals) look like, and what sort of portion sizes are you having?
If you are eating too little, you can try loading up on some more veggies and fruit or, since you typically have trouble enjoying those, eat more nuts for a while or snack on them between meals, add butter to everything, etc. Even just adding a glass of whole milk to a meal (whatever meal comes before your usual fatigue spells if they happen at a specific time of day) may make a noticeable difference if under eating is the problem.
Gathering fruits and vegetables would certainly make up a decent amount of food at certain times of the year. In more tropical climates humans could probably do it year round no less. But for most of us that are descended from good old fashioned Northern European white folk (not to mention people from other parts of the world such as various indigenous North American people's closer to the North Pole than otheers), until the advent of farming you wouldn't be able to base the entire diet on that stuff, and until we started farming grains and the like, getting it to store through the winter is pretty much out. Hell, if you tried to live as a hunter gatherer in most of Canada without ever eating meat it's a safe bet you would die since nothing is really growing for six months out of the year.
But what Quin said about being able to thrive on just protein and fat is pretty much true. They're the only two macro nutrients the body absolutely needs. You can cut out carbs completely and be pretty much fine in the long run (assuming your supplementing well and such. It was a bit easier for our ancestors when eating nutrient rich organ meat was considered the thing to do). Cut out protein or fat completely though and you'll die an early death. It may take a long time because our bodies hate us like that, but it will happen.







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