Thank you for your query at DoctorSpring.
First of all, I would like to reassure you that your symptoms are not suggestive of any serious neurological illness.
The most likely cause could be a migraine, where patients can experience heaviness of face and head on one side. For relief of symptoms, you can take rizatriptan tablets.
If the symptoms become more frequent, then, preventive medications may be required.
Also, an MRI of brain would be required if the symptoms become more frequent.
I hope it helps. Please get back if you require any more information.
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist