I felt uncomfortable while on the aircraft...What can I do?

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every time I'm on the aircraft for a short flight, I feel so uneasy. My hands will sweat all over and I couldn't sleep. I Have been traveling often but to me taking the plane is an agony. After all these years, Still I'm not able to overcome this fear. Lately, I was on an 11 hour trip, you couldn't imagine what I have been through during the flight, and In the next week or so, I will again be taking the same flight again. How do you overcome fears like this?