What Causes Muscle Weakness And Headache Just Before My Period?
Endocrine
Detailed Answer:
Sorry to note how you feel.
When I see someone like you in my practice, I tend to order the following after a thorough physical examination:
1 CBC
2 CMP
3 TSH
4 Free T4
5 (25) hydroxy vitamin D
6 Early morning (8 am) serum cortisol
None of these tests require fasting but the timing is important.
These will detect many possible causes of your symptoms. For example, muscle weakness can occur in both vitamin D deficiency and thyroid problems.
Electrolyte disturbances can also do the same and the tests above include these.
If you have a salt wasting condition the blood sodium levels ought to be low. These blood tests will reveal whether or not this is the case.
Cortisol checks for adrenal gland insufficiency which is one of the leading causes of salt wasting syndrome.