Dear An_,
The symptoms you describe do sound neurological and it's good that you are being tested for MS. You should undergo both brain and spine MRIs, a lumbar puncture, physical exam to test balance, strength, coordination and reflexes, and evoked potentials.
Having an immediate family member with MS only puts your chances of developing it at 1-3%. Though there is a genetic component, environment plays a major role in making the disease active.
Waiting for a diagnosis is the most stressful part of this. You are obviously feeling quite alone and apart, and people's reactions to your symptoms and concerns aren't helping. I was there once, and I do understand what you're going through. And having a history of depression certainly doesn't help the coping. Having a chronic illness often brings depression along for the ride. Many of us take medications for depression along with our symptom meds.
It might take some time to get to the bottom of what ails you. An MS diagnosis involves ruling out many other conditions that can mimic the disease. Once you can put a name to it and start treatment, things will get better.
In the meantime, rest when you need to, keep a symptom log to bring along to your appointments, and ask your doctor about symptom meds that might make you feel more comfortable. Muscle relaxers such as baclofen and anti-seizure meds such as gabapentin and Lyrica can go a long way in managing spasms, spasticity, and neuropathic pain. Anti-cholinergics such as Vesicare can improve a spastic bladder. And do feel free to come here with questions and concerns, we'll do our best to help you feel less alone in this.
Kim