Bachelor Contestant Clare Crawley -- Boozy Premiere Ends In 911 Scare

The goal of "The Bachelor's" 3-hour Season 19 premiere was to end up with a rose ... not an IV bag.

Former "Bachelor in Paradise" contestant Clare Crawley got comfy with paramedics Monday night ... after experiencing hot flashes, severe cramping, and unbearable nausea following a full day of partying leading up to the show's premiere party.

Clare tells TMZ after walking the red carpet she began to feel sick ... so while the rest of the crew partied she went back to her hotel room with former Bachelor contestant Michelle Money.

She was in such bad shape, Money called 911 ... LAFD came to the rescue with anti-nausea meds and tons of fluids ... while Money snapped an Insta-pic to chronicle the illness.

Crawley thinks dehydration and an empty stomach played a big part -- that and the fact she claims she never drinks ... which she did that night.

DATING TIP: Guys like a woman who can handle their liquor.