Hi Sheila
The meds are so good now at controlling the disease as opposed to just the symptoms that the progression can be slowed down to a remarkable level. The earlier the disease is treated effectively the better the result.
Sometimes the immune system can change along the way making the drugs lose their efficacy. No-one knows for sure yet why this happens, it's a kind of mutation process, but research is ongoing. However the current climate providing a good selection of drug therapies bodes well for future treatment.
Lyn x
P.S. Do you live in a place called North Preston or is it Preston (North), Lancashire?