Is Nuflor supposed to hurt?

I've only used Nuflor once before this year and that was two winters ago. I have very little recollection of that experience.
I am currently treating Kitty (4 year old Lamancha/Alpine/Pygmy) for pnuemonia. I do not expect her to live but everytime I go down she is still alive so I continue to treat her. I finally got my hands on some Nuflor and she acts like I am killing her everytime I give her her shot! Makes me think of injecting Ivermect.
Is this normal?

 

I was planning on giving it everyday but did not give her her shots yesterday. She had 2.5ccs of Nuflor and .5ccs Banamine on Monday (late evening). I missed yesterday. I gave her another 2.5ccs Nuflor and .5ccs Banamine this morning.
She is 85-90 pounds on a good day and has lost a great deal of weight (closer to 50-60 pounds at this point). She kidded 12/21/08 (first doe of the season). Has her firstborn doeling on her (though she is dry now). She was wormed when she kidded but looked anemic when I moved goats two Mondays ago so she stayed in the Corn Crib shed instead of being moved to the goat pen. I wormed her with Cydectin and gave her some Red Cell. Started treating her with Pen G over a week ago and moved her to Nuflor Monday after I got it. Her eyelids have pinkened up nicely but she has trouble breathing and coughs a bit. Her daughter is also coughing an I am strongly considering treating her as well.
On Monday she and her daughter were moved back into the cow barn and are in a pen of their own.
This doe has a very weak immune system. She is still eating and drinking, chewing her cud, making pellets, peeing, etc.