Iam in so much pain wiv side of my palate have a red inflamed line on topside gums from front 2 bk they can't find wot is wrong please help don't no wer 2 g?

Needs further test: Has your diet changed in the past few days or weeks? Does your mouth feel dry or does it seem drier than in the past? Have you changed your toothpaste or mouth rinse? It could be an allergy of some kind. You might see an allergist. You could also get the tissue biopsied to determine what's happening within the tissue.

Linear erythema: The red line on top of the gum is term 'linear erythema'. Most likely you are suffering from a condition of chronic inflame gum, which is developing into anug (acute necrotizing ulcerative gingivitis). The best treatment would be a good diagnosis and cleaning with your dentist, antibiotics (amoxicillin), good oral hygiene (brush with ultrasoft toothbrush), salt water for mouthwash.