Why do you "have to see her everyday"?
Where is that rule written and who was stupid enough to write it?
People need room to breath or they end up suffocating each other.
Idk many couples who can spend all their time together, and the ones who can, there's usually codependency involved, or they don't have any other friends and both enjoy the solitary bubble of just the two of them...
I think you're freaking out because your life is revolving around her and there's little balance in your balancing act.
Do some things without her, with separate friends, spend certain days apart.
You know what they say, absence makes the heart grow fonder.
This way you'll have an opportunity to miss each other and build excitement toward seeing one another.
Plus you'll probably have loads more to talk about.
Your depression and anxiety won't go away by dumping her, you'll just gain a different kind.