Whatever you do, don't ignore the lawsuit because a default judgment will enter against you, and you will then have to pay it even if you have a valid defense. Talk to a lawyer about what your options might be.
If Capital One Bank obtains a judgment, it can then garnish your bank account. They can also send you post-judgment discovery to determine where your assets and bank accounts are located. While I have not seen it happen in Texas, in other states people are going to jail for contempt of court for failure to respond to post-judgment discovery. You should certainly speak with an attorney about your situation.