Everyone's experience of diagnosis is different. You may have had a sudden, severe attack which demanded hospital attention and found that a diagnosis of MS followed very quickly.
However, MS is often difficult to diagnose so it may have taken you a long time to get to a definite diagnosis. All the symptoms of MS are seen in other health conditions so your doctors had to work out which one you have. This can mean having many tests to rule out other possibilities and then more tests to see if you have MS. It is sometimes a question of watching and waiting to see how your symptoms develop as this can help distinguish MS from other conditions. All this can be very frustrating and worrying but it is quite a common experience.
You may have been given another diagnosis which later turned out to be wrong or maybe you were told that the cause of your symptoms couldn't be found. Perhaps this was hard to accept especially if it was years before you were given the correct diagnosis.
It can be hard to understand why your diagnosis took so long but it is often a tricky call to make so usually no one, including you, was to blame.