If the symptoms are worsening, and numbness is involved, I would see the doctor. As to the MRI readings, simply put, the lower three discs are bulging which can put stress on the nerves. MRI also states some narrowing, which is common with bulging or herniated discs. This can also cause nerve issues. When the nerves rub or become compressed it results in the symptoms you are having. Hopefully PT works for you.