non-degree for raising gpa?

[apolytos]

Hi, i graduated with a low gpa (2.6) because of many factors such as my carelessness, family death,and don't like my major etc. After my graduation i asked my university that can i change my major and transfer similar courses to my next planning major (physics), believing they'd accept me because my first major was ee and had similar courses, also because i was a student of that school, i though they would accept me. But they said once you graduated, you can't study in undergrad unless taking Standardized test, btw i live in developing country in central asia, and transferring some courses and study as freshman because of school's internal order. And they said you could've studied as non-degree student, but now you can't cause you've graduated and no longer the school's student, but you can study master in physics and by doing that you can be our school's student again and study as non-degree student in undergrad taking some courses. (i know my country's, especially that school's rules are dumb). can non-degree courses be accredited and transferred? should i enter the school by master's student for taking non-degree course and study both masters and non-degree Ugrad courses? will Us and Eu or other countries' accept that non-degree courses, i'm asking this cause i heard that some countries exam seriously and don't accept such courses from some developing countries because there are some incidents that some developing country's students used fake diploma or something like that? Will Us and Eu countries consider my courses such way? i'm really depressed and can't decided what is the best way. is my future doomed?