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It is likely that the stress of not knowing the cause for your swelling is causing you anxiety. How is your sleep? For the swelling was there any imaging studies done to diagnose the cause or did you have a urine examination.
In that case your symptoms may be due to hormonal abnormalities.
Adrenal gland may release hormones that cause persistent or episodic high blood pressure in a condition known as pheochromocytoma.
Patients suffering from this condition will suffer from such episodic attacks of anxiety or sense of doom.
Thyroid problems, such as hyperthyroidism may also cause anxiety which was not previously seen in a person.
Please consult your doctor and get examined to know whether you are suffering from any hormonal abnormality. If present treating the hormonal disturbance will be beneficial with resolution of your anxiety symptoms.
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Make sure you get an adequate amount of sleep of at least 7 hours.
You may do mindfulness exercises for a few minutes every day.
You may drink chamomile tea since this may be beneficial for reducing anxiety according to some studies.
Hopefully these measures will maintain calmness for you.