I am not sure what state you are in and how your sister grabbed control, but it sounds like she greatly breached her fiduciary duty very likely intentionally and that you should go after her for these disgusting abuses for many times your actual damages if you can show intent; you might want to save any nasty texts or voicemails she may have left criticising your transition. That said, do you have insurance? Have you filed a police report (these sound like criminal acts of vandalism, which may even be covered). I am not saying you will get back to where you should be, but perhaps there is help out there?
Also, I know it does absolutely nothing for you, but this is why having someone you trust appointed as a trustee and to manage your medical affairs. I do not know if there are cheap or scale resources for transpeople for this type of thing, but this is why there sure should be.
Problem would still be ensuring that medical professionals are aware of the trust, and so it might be necessary to actually record it so its on title to the property--usually this is not done, but if was done in this case this could not have happened.
But yes, fight back! Family is not chosen by us and they can be the most brutal people on earth. I am deeply saddened by your situation and wish you the best.
Not legal advice, but I am a lawyer--I just cannot help but analyze it.