First off welcome to Healingwell. You will find alot of kind and supportive folks here. With the needles I used to be so freaked out about needles. I had allergies as a child and used to have to have an allergy shot once a week. Used to take multipe nurses, docs and my mom to hold me down. I was diagnosed with Crohns about 3 weeks after my 18th birthday. With the needles you just learn to deal with them. Now I am not so afraid of them, because usually I feel so bad I want those needles to provide me the medicine that will help me to feel better.
As to the crazy mood swings, that is pretty normal when you are on steroids such as Entocort or Prednisone. These are bad medicines for there side effects, but great medications to get our flares quickly under control. A kind of necessary evil. I have a wonderful husband. He is a very athletic and healthy man, but can become my gentle giant and when I am sick and can be so supportive of me. Its hard when you are so young. Hopefully you can educate him so he can be more understanding when you are having a bad day.
In my opinion the Fleets is the easiest prep to do. It has the least amount you have to consume to get the job done. Just chug it down and then follow it with something to wash the taste down. When whats coming out is yellowish clear, you will know you are cleaned out. The prep is the worst part as you are sedated when the actual test is done. One tip, don't wipe, but pat dry as you are going thru the prep part. Also, baby wipes without alchohol, and a diaper cream are really helpful.
Good luck on your tests and come here and ask any questions you have.