With regard to your main fears -
You won't feel any pain at the time, you may be a little sore afterwards.
Any blood, and there is usually only a little, will be sucked straight out of your mouth by the dental nurse who will have a little suction tube there ready.
You won't hear any 'crunching' unless yuour dentist has to break the tooth, which is extemely unlikely unless it is seriously stubborn. Almost all teeth, even big ones, slide out when extracted with very litle trouble.
I appreciate your anxiety, but if you tough it out, and get through this, it wil be worth it.
What you always have to remember with dental treatment is, by avoiding it, you are prolonging the inevitable, and simultaniously making it worse!
Ignore anyone who scoffs at your fear, I used to be so phobic i had to be tranquilsed to get me in the buidling, never mind up the stairs, in the room, and in the chair, so i do symathise with how you feel, but like almost anything like this, your fear will have been worse than the experience.
Good luck!