How to get rid of this feeling on roller coasters?

I got over m fear of roller coasters. My first time in April was the Griffon at busch gardens, 255 feet in the air, bottomless, 90 degree drop and I got over my fear. I went on that twice. I went on the loch ness monster twice, the Apollos chariot twice, but every time I got up I feel hella scared. During the ride I have a blast but going up that hill is scary. I'm going to Florida next month. I want to try the manta at Sea World which is a flying coaster. Can I get over my fear of going up, cause I kind of hate heights. I mean I just got over my fear of planes, and that's why I'm going and that makes me nervous. I need help about the coaster (only going up) and the plane (not severe). I'll be flying southwest and I have a laptop and iPhone and stuff and DVDs and games so I can be pre-occupied.