They're beating you at the discovery game (at least temporarily) because you don't know the rules of the game. Just because you might figure out 75% of what you need to figure out doesn't mean that you won't get clobbered by that 25% that you don't know about (and have no realistic way of figuring out in the short time frames you're facing). Do you care about this case? Is there a lot at stake? If you answer "yes" to either of these questions, then you might want to hire an attorney. Please don't get upset with me because I'm making sense, and best of luck to you!
As of the time I provided my answer to your question(s) today, I am NOT your lawyer and you are NOT my client. Therefore, there is NO ATTORNEY-CLIENT RELATIONSHIP between us. Accordingly, you should NOT construe my response to your question(s) as legal advice. Rather, you should look upon my answer as a "starting point" for you begin discussions with a lawyer of your choosing. I am always receptive to new clients, but there are many, many lawyers who will meet with you and give you expert, personal legal advice. My answers in this forum are NOT expert legal advice, but merely general commentary after reading the very, very brief facts which you provided to this forum. I truly wish you all the best!
You need to hire an attorney. Just because you objected to the production of documents doesn't mean that the non-party is not required to produce them. And your objection is not a court order; you'll ultimately need a court determination as you generally are not the arbiter of what is discoverable versus what isn't discoverable. If you feel that some of the documents are privileged or not subject to production, you have to demonstrate a legal basis as to why those documents shouldn't be produced. Keep in mind, the scope of discovery is broad and in most jurisdictions, so long as the discovery is "reasonably calculated to lead to the discovery of admissible evidence" then a court will allow it.
If you truly believe the documents are not subject to production, then a Motion for Protective Order should be filed. You need to articulate the legal basis as to why the documents should not be produced. Generally speaking, pro se plaintiffs are not familiar with what the rules of evidence allow and what documents are privileged, so you'd be better served in hiring an attorney.
DISCLAIMER: Brandy A. Peeples is licensed to practice law in the State of Maryland. This answer is being provided for informational purposes only and the laws of your jurisdiction may differ. This answer based on general legal principles and is not intended for the purpose of providing specific legal advice or opinions. Under no circumstances does this answer constitute the establishment of an attorney-client relationship. For legal advice relating to your specific situation, I strongly urge you to consult with an attorney in your area. NO COMMUNICATIONS WITH ME ARE TO BE CONSTRUED AS ARISING FROM AN ATTORNEY-CLIENT RELATIONSHIP AND NO ATTORNEY-CLIENT RELATIONSHIP WILL BE ESTABLISHED WITH ME UNLESS I HAVE EXPRESSLY AGREED TO UNDERTAKE YOUR REPRESENTATION, WHICH INCLUDES THE EXECUTION OF A WRITTEN AGREEMENT OF RETAINER.