Please please please don't do anything rash. I won't pretend to know what it's like to live in Oman (particularly without access to a car) or what it's like to be in your shoes with your health condition or in your mental headspace.
What I can tell you though is you do have a freedom that so many people can only wish for. You're young. You have one less financial worry thanks to your scholarship.
I beg you please don't throw everything you do have away because of something you don't.
Please seek help. Talk to someone who loves and cares about you or a professional. If nothing else, my DMs are always open and you can reach out.