I googled the medication that she was taking or had just stopped taking at the time. It's a medication for Myasthenia Gravis. It does mention that an overdose would cause breathing problems.

and it also mentions that if you have heart problems or asthma, that it can cause breathing problems as a side effect. I dont know if she has any problems like that, but that could be one explanation for the "psychological attack" problems.

http://www.medicinenet.com/pyridosti...al/article.htm