Drinking water usually helps me make it thru a rough patch.
But look at your whole daily intake. Are you taking in enough food thru out your day so you wont be hungry when the day is done.
Are you snacking enough. Are you getting in a good breakfast.
Look to see what you can do so that you dont have to go thru days like this. And look at what types of food you are eating, certain foods have certain reactions on our body. Getting enough protein or to much sugar it all adds up.
And congrats on reaching out and seeking advice thats great.
Everyone should do the same thing that is lurking.
All we know here is a screen name and what you write down in a post.
Letting out whats been bothering you and what you want to achieve is a great start. You have to start somewhere and why not be honest with yourself and just go for it.