You would be worried nonetheless, because your brain will latch on to the next anxiety. Just like you thought that having 5 years of expenses would alleviate your anxiety. What you need is a good therapist to work on your anxiety issues.
Therapy or meditation, likely both may help induce a shift. As the grip loosens you will find many things begin to change.
"Sleeping well at night", is likely the single most important thing you can focus on. If you choose to focus on that, it likely will permeate many aspects of your life..
You may find a deeper and more authentic experience and through that you may find that you actually have won the lottery. You are safe. You have 5 years of expenses - I guarantee you that you could figure out solutions to just about anything that comes your way in 5 years.
You're no longer trying to survive. It's now time to learn how to live.
I'm afraid there's simply no amount of money that can possibly remove the feeling that everything could collapse at any moment. If your sense of security is predicated on continuing to possess money, you will always be vulnerable to the fear of losing it, no matter how much you accrue.
If you won the lottery tomorrow, what makes you think you wouldn't worry about losing that money too?