5.9 12v wont start after freezing

Wondering if anyone can help out. I have a 1993 5.9 12v. Temperatures were at -30C and not surprisingly it wouldn’t start. Unfortunately I did not add any anti gelling product before the extremely cold temperatures hit. I added a little bit after it would not start then let it sit until temperatures went back to around -6C. It started but was running rough and blowing a lot of white smoke. I ran it for a couple minutes like that then shut it off. Now it won’t start again. Any ideas of what is going on? Thanks for the help.