You're not weak or stupid. You're just scared. That's an emotion that will pass. You may feel right now like you'll never recover - I know I have in the throes of a difficult trip. But you will. In fact, as inconceivable as it seems now, you may look back on the experience with awe and gratitude. I recently had a trip that ended in the ER, and I wouldn't trade it for anything.
And until it does pass, just relax and try to experience what's happening, really try to let it all in, with your body, your mind and your emotions. Try to offer no resistance. Like everything else, it will soon pass, and you can reflect on it later. Right now just experience.
And keep us posted. You're not all alone.
S/M