Welcome sister lioness! Congratulations of 17 days, that is awesome! That's great that you are feeling hungry, taking an interest in your appearance and just coming back to being alive again. Using takes so much from us that we don't even notice until we start to return.
If you lost a lot of weight while using, and what opiate addict doesn't?, that probably explains your hunger. We tend to prioritize fix first, food later if at all and your body is probably just trying to catch up on lots of missing nutrients. Go for it, eat all the good stuff you can and maybe add some vitamins to help your body with the withdrawals and recovery. And drinking lots of water really helps your body to detox and get better, too.
As far as feeling normal again? Everyone is different so it's hard to say. But you will feel better with every day you stay clean. It's worth it, it will be worth it!