So why worry about it? Why let it work you up? It's like being afraid of being afraid. It's like waking up one morning and getting into a huge state of panic over the fact you have arms. You will still have arms, your fear will just make using them more challenging.
The same applies with tomorrow.
If you fear tomorrow, if you let it niggle away at the back of your mind, if you worry about all the negative possibilities that may arise from it's very existence, then tomorrow will more then likely live up to your low estimations of it. You will say no to things you would have otherwise embraced to avoid anything bad happening. You will frown when a smile could have changed how a person perceived you. You will avoid talking to a stranger in case you don't get on, when a simple hello could have lasted a life time.
Be happy for the arrival of tomorrow. Enjoy today, but welcome it's neighbour with open arms. Offer it a cup of tea. It's only going to happen the once so make the most of it.
If you let tomorrow be everything it could possibly be then tomorrow will flourish and you will flourish with it.
Tomorrow just wants the best for you. Let it.