Sounds like your problem is with mlsmyhome.com.
You did the right thing by trying to get your house listed on the MLS. The problem, I'm guessing, is that because mlsmyhome.com uses agents around the country, the one assigned to your area isn't performing as he/she agreed to.
If you can't get mlsmyhome.com to respond, contact the Texas Real Estate Commission: http://www.trec.state.tx.us/ mlsmyhome.com should be (hopefully is) licensed in its home state of Texas. Here's a link to filing a complaint: http://www.trec.state.tx.us/complaintsconsumer/default.asp
I'd suggest one more attempt to contact mlsmyhome.com. If no response, immediately file a complaint with the Texas commission.
Hope that helps.