Hi.
If I would have been your treating physician for this case of anxiety,worrying,dizzy spells, I would come up with following possibilities:
1) First possibility is of
Hyperthyroidism.Further history such as tremors,sweating,weight loss,diarrhoea,menstrual irregularities can be evaluated. Diagnosis can be confirmed by doing
Thyroid Function tests such as Serum TSH,Serum T3,T4 and free T4.
2) Second possibility is of Anxiety disorders such as Generalised anxiety disorder,Panic disorder,
social phobia etc. It is diagnosed by carefully reviewing clinical history and no such investigation available to diagnose.Psychiatrist and
psychologist diagnose it by using certain assessment tools.
I would suggest you to get Thyroid function tests done.10-12 hours of fasting is required to get valid result. If they come normal then I would suggest you to
consult psychiatrist and psychologist to assess further.
I hope this helps you to understand your question.Even if you have any queries let me know.
Regards