High cholesterol pose problem in long term and it won't cause suddenly any problem immediately after the diagnosis. Remember it is considered a risk factor apart from many other risk factors like hypertension, diabetes, obesity, sedentary life, stress, alcohol and smoking etc. So, you need to leave worrying. Your are doing adequate to control your cholesterol. Since your BP and EKG are good, seems to be nothing which needs immediate medical attention. Palpitation is quite a common sign of stress and anxiety. Read here;
Hope this helps you. Your follow up questions are welcome.
Will consider possibilities of pinched nerves in cervical spine (neck) and back due to degenerative disc disease or cervical or lumbar spondylosis (bone spurs).
Also consider screening you for rheumatological disorders and get blood work like rheumatoid factor, ASLO titer, serum uric acid, Anti-nuclear antibodies etc.