Well, first of all I don't agree with the alchohol "solution", but that's a personal opinion.
Your worries are normal. Self preservation/fleeing instincts and all that. It's the calm ones who are odd !
See your Doctor ? There are drugs available, although that's a
bit drastic ?
If you travel a lot, then some airlines run courses for nervous fliers, or they should be able to put you on to organisations which run courses.
If nothing else, you should be reassured by the knowledge that you're being taken care of by pilots like me........ *gibber*..... *twitch*..... *dribble*.....