Yes, I am still with you, but it takes some time to type an answer.
It is excellent that an MRI was done.
Most atypical migraines are still migraines, but it is appropriate to pursue a neurologic evaluation if someone develops atypical migraines, particularly if they develop in middle age or older. The MRI would also exclude certain brain causes of visual changes. So it is good that an MRI was done and was normal. A thorough eye exam is also appropriate for the vision problems you have noted, but if no cause can be identified, then a detailed examination by a retinal specialist may be appropriate.
There are several other conditions that should be considered in the evaluation of these symptoms. If they checked for arteritis, then tests of inflammation were likely done, such as ESR or CRP, but if not done, they should be done. It also would be appropriate to check tests for metabolic conditons that can affect muscle function. Sodium and potassium levels are usually checked as part of a general metabolic profile, but magnesium should also be checked and usually needs to be ordered separately. Certain endocrine disorders should also be checked, such as for thyroid or adrenal disorders. It also would be appropriate to check muscle blood tests, such as CPK.
If I can provide any additional information, please let me know.