Here you have family history of muscular dystrophy, fibromylgia and MS. So yes you need to be careful. This all condition are genetically derived once it's there in family history. But triggering points will be too much of physical stress, mental stress, improper sleep, improper lifestyle as well food habits. So I suggest you need to get checked properly if you also have feeling of generalize body weakness.
For all this kind of my patients I strongly recommend the antioxidant supplement like vitamin c and vitamin e, along with omega 3. Because all this together helps to heal your body from inside as well also helps for prevention of it with its natural anti degenerative and anti inflammatory effect.
As of now you can take rest properly but still if you are feeling weak then consult your doctor. Early prevention is better then cure. Take care