I have problems with body temp, weakness and sleep patterns

You would need the following investigations:

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

Autoimmune panel

Anemia panel.

The causes of fatigue and your symptoms;

Thyroid disease

Connective tissue diseases

Chronic anemia

Neoplastic disease

Chronic infections like Epstein Barr virus

Endocrine diseases (Addison disease).

Chronic fatigue syndrome

Myasthenia Gravis.

I hope your symptoms resolve soon.

I would be happy to assist you further if you need any more information.
Thanks for using JustAnswer.

You may consider the following also;

1) Recurring episodes of weakness should raise the question of periodic paralysis.

2) Weakness exacerbated by effort and relieved by rest is characteristic of myasthenia gravis.

3) Proximal muscle weakness suggests a myopathy, whereas distal muscle weakness is more consistent with a peripheral neuropathy or pyramidal tract disorder. Myopathy would be detected by a blood test creatinine kinase.

4) Recurring episodes of apprehension, tremulousness, and palpitations are seen with generalized anxiety.

5) Weakness or fatigue that occurs only after work, fasting or insufficient sleep is most likely explained by normal physiologic mechanisms.

6) 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 are very welcome.

Wishing you a speedy resolution and all the very best in life.

It was a pleasure to assist you.

Thank you.

Stay blessed.

Thank you.

Good luck.