nervous to go on long awaited holiday!

hi everybody - this is my first time posting in this sub! i’ve always been a nervous flyer and i get so anxious on planes, especially during takeoff, but my anxiety has gotten so much worse recently. i hate the dropping feeling on the way up - like when the plane feels like it’s falling for a split second, does anyone know what i mean? me and my partner have a holiday booked which means we’ll be flying from the UK to spain in a couple of weeks. and we are both terrified. we’re flying on a 737. does anyone have any advice? are 737’s historically safe?