More About Vaccinations

I've been vaccinating my horses for as long as I've had them. A steady 7 years. And there has been a fair few here. I come home from work this morning after a 12 hour shift and a 45 minute drive both ways to find Kola extremely lethargic. The girls were vaccinated on Monday and she's been increasingly lethargic throughout the week. Laying down more and more. So I check her out and call the vet because she's just not right. We concur over the phone that it might be a reaction to the vacs and I go out and give her a little over a gram of bute. She gets gaggy and even more sleepy. I call the vet back because now she's wobbly on her feet and unbalanced after about an hour and a half of watching her. So the vet comes out to see her because now I'm wondering if she's collicking because I've seen Misty drink at least five times in two hours and Kola not a drop. She hasn't pooped or peed and I am confused. He checks her out. Of coarse now she poops in front of us, but it's loose. He takes her temp......normal. And he really believes she's wiped out from these vacs and it's not collick which relieves me and suggests a gram of bute a day for the next three days. Says they both look good and healthy. It's another Saturday vet bill. Crap! And right after the vet leaves she walks into the lean-to and pees. Good grief! Why did she have to wait? If she had done her bodily functions earlier, I probably would have felt better and handled it myself. On top of that, in the five years I've had Misty, I have never witnessed her laying down, never in five years, especially in broad daylight. And I am always watching my horses as evidenced by the numerous pictures I have of them. While waiting for the vet I glance over to check on Kola and low and behold Misty is laying down.....flat.......farting and twitching in R.E.M sleep. They're testing me . I know it. I've never had a horse react so strongly and so long to a vaccination. The vet said more than likely the West Nile is the culprit. I do know a lot of vets are changing vaccination companies because there's a brand out there that is an old standard which is causing issues, what those issues are, I can't remember. I wonder if these new vacs are stronger. I'm wondering if anyone out there has experienced this sort of reaction?