HELP NEEDED. Curing it except surgery?

I have exotropia of 15° in my right eye which is intermittent and I had already opted for its surgery when I was 7 years old after 8 months of constant exercises. It has been appeared again since 6 years and it is very embarrassing. I don't want to go again for surgery as several doctors claimed that it can't be guaranteed that squint won't appear again. Although my vision is perfect 6/6 in both eyes yet squint appears especially when I stare on a screen for some time and after hard blinking it reverts back to the normal position. My questions are 1. Why that squint appeared again? Is this a brain related problem? What if I go for a MRI scan to know if any nerve is blocked? 2. Is there any way of curing it except surgery? My present age is 26 years (male). Thanks.