Dreaming of an atomic bomb means you are encountering a lot of difficulties in life, or having many issues being unaddressed leading to your biggest wish is to start all over again. The reality is that life is hard, and everyone goes through the same difficulties. Instead of starting over, prioritize your issues and tackle them one at a time. Once you have managed to deal with all the issues at hand, you will come out a stronger person.
Starting over does not help you in becoming a better person who can manage tough and difficult situations. It would sometimes drag you back to the same stressful cycle if problems are left unaddressed properly.