How can I get back to feeling okay?

I think I may need a therapist. I’ve had this weird feeling deep in the pits of my body. I don’t know if I’m depressed but I definitely feel anxious. I’m sad in a way that I don’t know why. I saw one of my sweetest classmates died recently and I felt weird about that. And then this crazy satisfy of some guy going around spreading incurable stds that I was in a sense close to. (I got tested). But it just gave me a realization that anything can happen anytime at any point. Maybe that’s it. I’m never comepletely safe. Never completely secure. That scares me really bad. I feel uneasy because what if one of these things I can’t control happen to me. What if I do get an incurable std or die suddenly. How can I be okay about that?
How can I get back to feeling okay?
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