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The palpitations, breathlessness, headache etc are symptoms of anxiety and panic attacks only. Severe panic attacks present with palpitations, sweating, tremors etc are main symptoms of anxiety.
Severe headache is also a presenting symptom. Chronically severe anxiety and panic attacks precipitates depressive symptoms. Due to this you are feeling tired and have loss of energy and fatigue.
I would advise you to visit your psychiatrist for expert opinion about your condition. If headache is very severe then you can take over the counter analgesics like
Paracetamol for relief. For relief of anxiety medicines like Clonazepam,
Propranolol etc are used. These medicines help to relieve the symptoms of anxiety. Medicines like
Fluoxetine, Paroxetine etc are used for treatment of anxiety.
Consult a Psychiatrist for detailed prescription.
Non medicinal treatment in form of Behavior therapy and relaxation exercises is also very useful in anxiety.
Thanks