There are a handful of case reports that describe Bell's palsy or a similar kind of facial weakness preceding the diagnosis of MS by a few months to 2-3 years. Unfortunately, a CT head is not adequate for looking at the brain for MS. The diagnosis of MS is a clinical one that is based on MRI findings, clinical exam and history, and spinal tap findings. You've had little workup so all I can say is that you may be at a slightly higher risk for developing MS than the general population as you have a family history and focal neurological syndrome as a young female. Anxiety may also be playing a role, but before chalking all this up to stress I would consider getting an MRI brain. Talk to your neuro doc and see what he/she thinks. Best of luck to you.