The main feature of generalized anxiety disorder (GAD) is persistent worry that is severe and frequent enough to disrupt your life, and generalized, meaning it can be about anything - fears of dying, worry about financial things, and random things fit this. Social anxiety is specifically a fear of social interactions - you mention being worried about saying the wrong thing, and don't know what to text back to people for a whole day. This also sounds like social anxiety. BeyondBlue has information and checklists to get you started examining this, for both GAD and social anxiety (sometimes referred to as social phobia). Do check out the link below for both of these if you think you would like to:
You have also been through a lot - moving to another country and the traumas you alluded to: what country did you move from, and I assume it is Australia you moved to?
The above comments are right, it would be best to see your GP, who may recommend medication and therapy (Cognitive Behavioural Therapy) with a psychologist. The psychologist will be able to assist you with talk therapy and perhaps other things like progressive muscle relaxation, mindfulness/meditation etc.
You can have two disorders at the same time. GAD and Social Anxiety Disorder have been often found to occur together.
Again like someone else mentioned, this forum is not for diagnosis - that's for a Clinical Psychologist or Psychiatrist to do - if they do. But I think it's worthwhile to at least know about them, and the Beyond Blue website that this forum is a part of has information on it, so why not.
I speak as someone in my 30s now, who has grappled with generalized and social anxiety for over two decades now, so I am an expert, and happy if you want to keep chatting here, talk about my experiences of what works for these kinds of anxiety, or if you want to ask any questions.