I reviewed your investigations which are not worrisome.
Your symptoms can be due to;
1) Mild infection
2) Hormonal issues.
You would need the following investigations to ascertain the cause (some of these are normal which you have posted):
Complete blood count (CBC)
Liver function tests
Thyroid function tests
Erythrocyte sedimentation rate (ESR)
Serum electrolyte level measurement
Immunoglobulin M (IgM)/immunoglobulin G (IgG) coxsackievirus B titer
IgM/IgG human herpesvirus 6 (HHV-6) titer
IgM/IgG C pneumoniae titer
Following investigations need to be pursued for unexplained fainting;
1) MRI with gadolinium contrast
2) Magnetic resonance angiography (MRA)
3) Tilt table test
4) Carotid sinus massage
5) Electroencephalography (EEG)
6) Stress cardiac test
7) Total creatine kinase (CK) and heart enzymes; done immediately after the fainting episode and would tell about the abnormal brain or heart activity that caused the fainting.
8) Following also may be done after the fainting episode; blood electrolytes and blood glucose.
These should be able to zero down the cause.
I wish your symptoms resolve soon.
I would be happy to assist you further if you need any more information.
Thanks for using Just Answer.