What’s caused this sudden fear?

I love swimming and nothing ever happened to me in the water or anything like that. Just one day I went to the beach and my mind told me that a shadow in the water was actually a shark circling me. Panic set in. It was the most random thing ever. That was just 2 weeks ago. Went back last weekend and the same thing... show more I love swimming and nothing ever happened to me in the water or anything like that. Just one day I went to the beach and my mind told me that a shadow in the water was actually a shark circling me. Panic set in. It was the most random thing ever. That was just 2 weeks ago. Went back last weekend and the same thing happened in like 3 feet of water. I’m going again next week. How can I overcome this really stupid irrational fear? And if nothings happened to me why would I suddenly develop a fear of water that I’ve been in weekly, my entire life?

I have no idea what caused me to suddenly think this way.
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