I absolutely loathe flying, have since a flight I was on was hit by wind sheer and we dropped several thousand feet before the pilot regained control. My children and grandchildren live in the USA and I have to force myself onto the plane every time I go to see them. They're settled and happy in America, I miss them terribly and pray every day they'll all decide to move back to Britain.
My husband has Asperger's - he hates driving, hates being the passenger if I volunteer to do all the driving when we go South to visit friends in Devon. We live in NE Scotland so it is a rather long drive through some difficult traffic areas (wowsa is Edinburgh, Glasgow, Manchester, and Birmingham traffic a nightmare, or what?!) but I love driving and have taken the recommended safe driver course (for older drivers, check the DVLA pages online, wonderful course!). But he hates being the passenger in a motor no matter who is driving. We're coming up on our 7th wedding anniversary - it took us three years to work out how why he pushed for flights down instead of the train or driving, and made me feel so unreasonable for not wanting to fly.
After a 'lightbulb moment' discussion, we've worked out it's best for him to fly - he enjoys an extra day with his fishing mate, and I enjoy the leisurely two-day drive down. I take back roads to avoid the motorway traffic and stop overnight at a mid-way located school friend for a lovely overnight gab-fest. We now both enjoy our journeys, and the time with our Devon friends. Win-win.
Jeannie99, find out why he's not supporting your feelings in this, he may have a similar loathing of trains and motors to your loathing of flying. If he does, it seems a no-brainer for you both to travel in your preferred manner. If you don't feel happy to travel alone, you might find someone you're happy to travel with to share the journey - or you might give a long day trip alone a trial go, somewhere that requires a 2 or so hour one-way journey to arrive to. You might discover you actually rather enjoy taking a trip on your own and is more fun than you'd thought.