My CPK level is 404.3. Is this normal?
According to Ask.com normal CPK levels can range from 22 to 198 units per litre. They do note, though, that levels can differ due to race, gender or activity levels (or pharmaceutical drugs).
Given that your levels are twice as high as 'normal' my guess is the above factors would not make that much of a difference and your levels are considerably above normal. Check with your doctor to be sure.
Here are some links that might be useful to you:
Symptoms of a Heart Attack and Stroke
5 Things to Know About Your Heart Rate