Sorry to hear this. First i would serioulsy consdier retaining an attorney and not trying the case yourself, if you can't then you should file what you need to and ask that it be heard due to the time constraints placed on you by the other side. The court is all about equity and fairness. good luck and take care. I would not just show up, i would either ask for a continuanc or file your motion asking that it be allowed, whatever you do, i suggest do it immediately.
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Pleadings can be amended within 7 days of the trial date without asking for leave of Court. See Texas Rules of Civil Procedure 63. Therefore, your objections to opposing counsel's amended petition may be denied. The good news is that you can still amend your pleadings without asking for permission from the Court if you are within 7 days of trial.
If opposing counsel has alleged new causes of action that you will need additional time to prepare evidence and obtain witnesses to defend against, then you need to tell the Court exactly that by filing for continuance. God's speed.