PLEASE BE REST ASSURED that on the basis of the one or two quarrels that you mentioned, you cannot be declared insane. Even the SMSs sent by you to your husband would not be enough to say that you are insane. No divorce would be granted by any Court merely on the basis of such wild allegations.
Having said this, and when you are so worried about your future, my sincere brotherly advice (though not asked for from me) would be to maintain cordiality in relations to the maximum extent possible. The way in which you are fearing about divorce suggests that all is not well between you and your husband. After all, life is give and take between two good souls. I am not holding any brief for your husband. And however big the disagreement may be spilling it near the juice shop etc., would not behove of educated people.
If you have any problem, better consult your elders, do not take matters to the extreme, have the tendency to forgive and forget.
WISHING YOU TENSION / CONFUSION FREE LIFE AHEAD. MAY GOD HELP YOU.