Hello ALittleOne: I see this is your first post here on PC. So... welcome to PsychCentral! I hope you find PC to be of benefit.

Unfortunately, I don't know what to tell you about the situation you describe. It just sounds to me as though your sister has her own issues (which you mentioned.) And perhaps the two of you being together is simply not a good mix? Your sister cannot heal you. Likewise you cannot heal your sister. And your parents can't heal either one of you. So perhaps the answer here is for the two of you to go your separate ways & do whatever you want to do / need to do in order to address your individual concerns... to follow your own paths, so to speak. Whatever that is. And then, beyond that, learning to establish & maintain your personal boundaries may also be of help. (Three of the articles listed below address this subject.)

There is a forum, here on PC, dedicated to the topic of anxiety & panic attacks. Here's a link:

https://forums.psychcentral.com/anxi...c-and-phobias/

And then here are links to a selection of articles, from PsychCentral's archives, on the subject of how to manage anxiety & panic attacks, how to establish & maintain personal boundaries, & how to deal with difficult family members. This looks like a lot of reading! But the articles are short. So it's not as much as it may appear:

11 Tips to Help Manage Anxiety

9 Ways to Reduce Anxiety Right Here, Right Now

15 Small Steps You Can Take Today to Improve Anxiety Symptoms

Top 10 Lesser-Known Self-Help Strategies for Anxiety

https://psychcentral.com/blog/how-to...ess-fails-you/

https://psychcentral.com/lib/tips-to...-attack/?all=1

https://psychcentral.com/disorders/a...eatment/?all=1

https://psychcentral.com/lib/what-ar...do-i-get-some/

https://psychcentral.com/lib/keeping...our-needs-met/

https://psychcentral.com/blog/how-to...amily-members/

My best wishes to you...