Hi. I'm wondering if the child psychologist explained to you the significance of the difference between his Full Scale IQ and the Language Component. If not, or even if he/she did, contact the psychologist for more information. It's possible your child is twice exceptional, which means there is a significant difference between his learning abilities (e.g. gifted in one area, but not gifted another). If the psychologist isn't well versed in twice-exceptionality, start researching it yourself. Linda Silverman's book "Upside-Down Brilliance: The Visual Spatial Learner" is an excellent resource in this area. NSWAGTC had copies a few years ago if you can't source it elsewhere. Kids who are twice exceptional often find early learning frustrating because they are aware of a significant difference in their abilities and it is confusing (e.g. why can I understand everything people say to me, and yet I find reading so difficult?). Your child's frustration could be due to several issues e.g. the majority of gifted kids are introverts and therefore find a school environment very stressful, it could be that his resilience is down as we are approaching the end of the term/year, it could be that he is yearning to learn certain things but can't do it in the school environment, etc etc. If you decide to take him to a psychologist in your new area, try to take him to someone who understands about giftedness (including twice-exceptionality) - don't assume that all child psychologists know about this!! I have two twice-exceptional boys, and we have found homeschooling a very rewarding alternative to the school system. It allows us to focus on their interests, at their own pace, and I support them when needed. I have found that now that I understand their learning needs, I am better able to discern what is stubbornness and what is frustration.
A final note, this will be a distressing time for you, but don't give up, you will know when you have the right information because things will "click". Keep loving him through this tough time, as you obviously are.