We used bribes too - especially when my daughter was younger. When my daughter was severely underweight and so malnourished that her doctors were worried about her organs, my husband promised her a kitten for dealing with an NJ tube for several months (a different kind of feeding tube that goes into the small bowel and cannot be inserted every night).
As you can imagine, we were extremely desperate to get her to cooperate!
So now she weighs 25 lbs more and is at a healthy weight and we have one extra cat
!
Usually though, we used smaller bribes - a new movie or a book or a treat (anything with chocolate works well
). With shots and IVs, keeping her distracted might help - for example, watching TV or a video on an ipad with headphones.
I will say that some parents tell their kids that meds are non-negotiable and have them talk directly to their doctors when they are refusing a medication. This works with some kids and with others, it doesn't.
I would also definitely talk to a psychologist so she can learn how to cope with procedures. Unfortunately, there are going to be a lot procedures and medications and needles and she will have to learn how to deal with them.
Holding down a 12 year old isn't really a good option - what happens when she becomes bigger?
An anti-anxiety medication might also be a good idea - a psychologist or psychiatrist should be able to help you with that. Often it is just given temporarily till the child learns how to deal with procedures/tests.
In terms of suppositories, my daughter also said that they hurt. We used a lot of vaseline, but she HATED them. I would talk to your daughter's GI and see if there are alternatives. My daughter found enemas less painful and I have heard that there is a foam enema "cortifoam" that doesn't really hurt at all.
I think it is definitely worth discussing your options - they even be able to give you some sort of numbing cream so that it hurts less.
Hang in there - it will get better.