Changed countries and since i have sudden heatwave in my body with intense itch which goes away as soon as it came. i can't go out into the sun because i feel extremely itchy under the sun and this only happened after the change of countries?

Are you taking any medication or supplements that can make your skin sensitive to sun? Is there a family history of sun sensitivity Is itching your only sensitivity? No blistering? Of course the obvious treatment is to avoid sun exposure. Take antihistamines as needed and apply skin moisturizer. At this time you don't have other symptoms to suggest an autoimmune disorder.