Oh huni, sorry to hear you're feeling down
Not sure if it's normal or not but remember you're going through huge changes, not just physically but emotionally too. You're used to using food to soothe/comfort/distract etc, etc yourself, as have all of us to varying degrees. You're bound to feel a bit out of sorts. Just hold on to the thought that all this effort you're putting in now is going to get you to an amazing place where you can be proud of your achievements and that will be the best feeling in the world. Perhaps make a list of all the things that losing weight will change in your life, something that you can look at when the going gets tough to remind you why you're doing this? These will be different for all of us but I should think a few that apply to us all are:
Better health and feeling of wellbeing
Being able to wear great clothes that YOU choose, not just because that's all that's in your size
Confidence and self-esteem
Respect from others for your achievements
More energy.
These are just a few suggestions. I'm sure you must have many more of your own. If you can concentrate/focus on WHY you're doing this then maybe it will help you to feel a bit more optimistic? Its usually true in life that anything worth having is worth fighting for and makes us appreciate it all the more when we finally get it.
I hope any of this helps in any way hun. Just remember you deserve to be happy, so be kind to yourself and be proud of what you've achieved so far. You're doing great!
xxx