Your husband needs help. You know that already, but just thought I would start with that, as it is important. You can go to the pre trial and say that you need time because the interogatories just went out, you cannot find a lawyer since they are all out of town and most importantly, you have been trying to reconcile with your husband, who you believe now needs help. You want time for counselling for the marriage and your husbands situation. Also, you and your husband would prefer to go to mediatioin instead of trial, if that is the way it goes.
You need to go to court today, since it is probably too late to get a continuance. Your H might not show up. If he does, tell him you do want to reconcile, but first he needs to deal with the drinking. Tell him that you are willing to help him with this, since you love him and want it to work out. You are willing to try, but he has to agree to work with you. The real home run would be if you get him to agree to withdraw the case today. He can always start again if things do not work out.
There is hope here, as your husband is reaching out for help. He is caught in the quicksand of alcoholism and does not know what he is doing. That can be solved. My experience is that 12 step programs are not the greatest. Rehab is good, because it forces a detox, which the first step, but in the end there is only one way to quit drinking ... don't drink (at all). Simple as that. He wants to stop and get back with you.
Back to today. You have to appear. Ask for time for the reasons stated above. Be nice, calm and rational. When you see your husband, get him to agree to a withdrawal. Then when your case is called for this settlement conference (that is what a pretrial is, basically), you can tell the court that you and your H have decided to withdraw the case to try and work it out.
If he will not withdraw, buy time the way I said. Very tough for the court to move forward when you state on the record that you need a lawyer and you are trying to find one. Also, the open discovery (interogatories) means you are not ready for a trial. Finally, when you say you want mediation, the court should be receptive as they want as few trials as possible.
So now you have a game plan. Go in there and see how it goes.