Iam not an expert so i can only talk from my own experiences, 12 or 13 years ago , there is no way i will go out side from my home without someone closed..but today i can go anywhere wherever i wanted to do all by myself and use public transportation whatever i want ..iam not saying theres hope but i think your situation can be change with times and practices and lots of patience .
with me what make it works is i faced my fears , i made myself went to the cinema where all people are either with their friends or couple and families and iam the only person who was there all by myself, it was so scary but it was feeling good afterwards, and theres so many timed i made my self went to public place all by myself until i feel okay with that , but i do made a plan and small steps in the beginning ,i.e if i need to go to supermarket i will go early inthe morning coz not so much people there yet and park my car to the nearest entrance as possible and after i comfortable with the place next time i will increase the challenges.. but i do realized that everything works differently for everyone tho, so what might works for me not works for you but maybe its worth to try ...

Hope you can get out from your unfortunate situation soon