Your medications can be the reason for tiredness.
All prescription and over-the-counter medications should be considered. Frequently used medications such as antihypertensives, sedative-hypnotics, antidepressants, tranquilizers, and antihistamines are common causes of fatigue.
You would need the following investigations to ascertain the cause of fatigue/tiredness:
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
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