How do you stay brave?

Last month after some weird symptoms I was diagnosed with something way worse than I had thought and had to stay in the hospitial for a week - it turned out to be something better than the doctors first guessed with a way less chance of happening again, but I'm still having symptoms now and then. I'm really struggeling to go anywhere else that's not work or grocery shopping out of fear of a symptom flair up. I'm so grateful that it's not as bad as suspected and that I can go back to work and all that, but I'm always waiting for the other shoe to drop, that it gets bad, that the low chances of another incident catch up with me. It's so tiring to think that there's no choice but to keep going on and to force myself out there before I can get really agoraphobic, which I already have a slight tendency to. So how do you stay brave? How do you deal with the fear of something happening, especially when you can't crawl back to bed afterwards because you're not at home?