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Thanks for providing more information.
Well as you describe,the sensation of fluttering relates to changes in heart rate and rhythms.
These changes can occur for brief periods due to stress/anxiety, fever/illness, during/after strenuous exercise,low blood sugars, hyperthyroidism (overactive thyroid), electrolyte abnormalities,cardiac arrhythmia and anemia or for no known reason. Caffeine, tobacco
, alcohol can also aggravating factors.
If palpitations are accompanied by lightheadedness,dizziness,headache, chest pain, sweating, or shortness of breath then it is strongly recommended to visit ER ASAP.
EKG must be done in your case.
Apart from this,cervical spondylosis should be ruled out as well in your case which can cause neck stiffness,tingling sensation,pain in arm,chest,dizziness,headache.
You should maintain a good posture.
Also take proper rest and avoid any strenuous physical activity for a while.
Also take Aspirin.
Eat low fat diet.
Hydrate yourself with plenty of fluids.
Do gentle massage and apply warm compresses on back of neck.
It's good to see a doctor ASAP.
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