thats a lot going on there! so even if it is difficut for you to comprehend everything that is happeneing, just let her be and let her know briefly but surely that u are there for her. maybe she is also taking a lot of responsibility on herself and struggling to maintain her composture in front of everybody. since u are on medications for your issue, and more in control now. i think it is only the need now that your sister gets the quiet support from u and hopefully others too. she needs to release all that pent up nervous energy within her. write a letter about how much u appreciate her and how she holds up in life for everyone(everyone likes to be appreciated) or some activity that u know she likes like a picnic or drive , yoga or window shopping. u could expect some breakdown but its for the better, she seems more like a ready to pop soda can. so just dont question her wellbeing too much, do something quiet and calm activity . it will work great for both of u and for your relationship. god bless. hope it helps...TC