I'm being sued by American Express. I have to answer several interrogatories and request for production.

You need to hire an attorney immediately. There are a number of attorneys in Houston who routinely defend these types of cases. It is surprising to most, but it is extremely difficult for a credit card company to prove the amount of a debt that you owe for reasons that are too complex to address here. In addition, there is quite often a violation of the laws relating to debt collection in the process of collecting these debts. If you hire the right attorney, you may be able to both defeat Amex's claim and they may end up having to pay you money.
I would suggest that you contact Dana Karni. She is knowledgeable and is a frequent contributor on this forum.

Look up Rule 196.2(b) and Rule 21a of the Texas Rules of Civil Procedure because these two rules interplay with each other. Your true deadline to serve depends on the method of service used to serve you in the first instance. Hand delivery and facsimile transmissions received before 5 p.m. now have true 30 day deadlines in which to serve your responses to the other side. It also depends on the method of service you choose to use when responding. Please be careful and make sure you understand these rules extensively.

If your credit is compromised already, you may want to start fresh and file bankruptcy. Call a bankruptcy lawyer in your area for a consultation. Then, you will not have to deal with answering discovery as all lawsuits, litigation in stayed pending the bankruptcy.