The hunger and lethargy will subside. It can take up to 2 weeks for your body to adapt to using fat as fuel rather than carbs, so hang in there!
35% carbs is not that low though. Personally I find I only feel good when I keep them really low - around 30-40g a day (not counting fiber) or about 10%, and get 55-60% of calories from fat. Different people will have different results, but if you were ever overweight or have poor insulin management, you'll likely do better with lower carbs. At 35% you'll be stuck in the middle ground, neither here nor there, like a never-ending induction phase - tired, cranky, brain fog and cravings. That's my experience, anyhow.
MOD's blog is the place to look for the 101.