Dear Asia,
what you describe regarding your spine and getting pains when there are sudden changes in temperatures or humidity is not unusual. Obviously of all places UK and Ireland are known for these quick changes. Maybe a countries like Italy, southern Franc, Spain or US would be better for you, however if you have to go to the UK then southern coastal area may suit you: the climate in general is somewhat milder (some even claim it is subtropical in Torquay, which I cannot confirm)