No, the radioactive stuff is just radioactive stuff. It's not a medicine of any sort, so there's no reaction to it, unless you are allergic to it (someone else on here said that they heard it was shellfish based). Now, the second stuff they put in will cause your gall bladder to empty, and that's the uncomfortable part. It will make lying down uncomfortable and you will feel nauseated. That will last about
5 minutes, tops, I seem to recall.
You're 100 times more likely to stress yourself into a heart attack than the medicine for the test to cause one.
If tests make you really nervous, then call your doctor's office and see if they will give you a valium to take beforehand. There shouldn't be any problem with taking one before the test, so long as you have somone to drive you. Of course, come to think of it, a valium might relax your gall bladder and digestive tract and it might not react accurately.
Anyways, I've had this done three times and I'm not dead yet, and I didn't vomit on anyone, so you'll be okay. It's not as bad as a colonoscopy, I assure you.
It shouldn't give you D, but I can't say that for certain, as I had D off and on all the time, so how could I notice? Anyways, it didn't need to make me go to the bathroom before the test was over.
Make sure you tell your technician that you have some issues with tests and lying on your back. He or she may be able to play soft music for you or tell you jokes or something to keep you engaged. My mother came back with me for my first test, so if you need your husband, ask to see if he can come back and talk to you because you get panicy otherwise. My stepfather did my other two tests, so I watched the screen and asked questions while it was going on.