Hi and welcome,
It's in your best interest to keep very open minded on what could be causing you these issues at this early stage of testing.....MS is honestly just 1 of many different types of medical conditions that can cause these types of symptoms.....breath!
In regards to if you would still be able to parent your kids and do things with them IF you were actually diagnosed with MS, the answer is a definite YES!
MS is not the same as it was before the disease modifying drugs became available, there are more symptom treatment option available now and patients today are more informed and connected. People with MS if they are so inclined can still climb mountains, run marathons, wakeboard, raise families, finish their education, have careers and live their dreams....
The brain and or spinal MRI is typically the first step in the diagnostic process, it helps rule out or in a lot of the potential causes but further blood tests, lumber puncture, visual, peripheral nerve tests etc etc are also part of the diagnostic process of working out what it might be. 4 weeks may seem like a long time but it's honestly not unusual for it to take months and sometimes even years before tests conclude the causation so hang in there!
Hope that helps......JJ