How do I defeat my fear of flying?

It's causing problems in my relationship because he wants to go abroad and I hate flying. We went to Mexico in November (so a 10 hour flight) and I was hysterical, crying and shaking and it stops me from looking forward to going on holiday and it makes me anxious while I'm there. I know it's the safest form of transport, I know all the facts and stats but it doesn't stop me being totally convinced that I am going to die and never see my family ever again. Every tiny jolt petrifies me. My fiance wants me to go on holiday in 3 weeks so I need to feel a bit better before then. I don't want to ruin everything for him just because I am scared and I don't never want to be able to go on holiday again.