Thanks for writing to us.
The combination of a shaky body with rapid heart beat indicates that our sympathetic nervous system
(SNS) is activated. It is the part of our autonomic nervous system which is activated by danger/ fear/ anxiety/ challenges /stress. We have to look into any of these causes.
Since your doctor have examined her and found nothing, we have to look for a cause for this. Tea/Coffee/ anti-asthma drugs/ Nasal decongestants/ Anxiety state/ overactive thyroid can all cause this.
Best way to be sure is to check her pulse rate when she is fast asleep (not laying only). If it comes out to be significantly lower (~25%) then an organic cause will be less likely.
Please see your neurologist
for her headache and rule out migraine
as a cause of her headache and tiredness
. Anxiety / panic attack
may have all this features. But a Neurologist opinion is a must before making that diagnosis.