Can too much barium intake for example 6 -32oz barium smoothies and two 8oz of the thick barium cause throat pain & swelling, nausea, weakness?

Sure: I guess my first question would be why are you taking so much barium? Second, what is the time frame that this has all been ingested. If it is a short time then it can cause some GI upset. I would start by taking just water for a while to dilute the barium. If it persists, then see your physician.

Strange question: I'm not really sure what you mean by this question. Barium smoothies are used for imaging the intestines or the upper digestive tract. They do have side effects which can include those you're concerned about. If you have intestinal problems and have had multiple studies over a long period of time and have consumed this it's probably okay. If you're drinking this for fun stop immediately.