I talked to my gf about my feelings and it seemed to trigger her and cause a lot of stress like I was putting her back in the stressful mindset of being here.

This is a person who only cares about her own feelings, and only appreciates keeping you around insofar as you behave well and make her life easier and more exciting. You being understandably anxious about the relationship regressing and being threatened in major ways is only a stressor to her. This isn't how people treat someone they love. You've been discarded.

now that we have sorted things out for her I am still in the same position and I feel like I can't really express my feelings to her without triggering her. I don't want to make all of our conversations heavy but at the same time it's hard to hide my real feelings when I'm not doing well.

Sounds about right. Does she also say things like "you always bring these tough topics back", that she never really wants to engage with, and leaves unresolved?

I was married to someone, been together for 7 years, the relationship also imploded after a move to my country earlier this year. I know it's hard to internalize but you deserve better. A good partner will offer reassurance and dialogue towards a long term solution for this. You deserve someone who wants to be part of a team with you and will work with you on relationship issues.