A bad day !

Today is a bad day for me, My experiment failed again! The experiment has cost me nearly a month 。After the first failure ,I analysed the possible reason for the failure and did it again, but failed again and again. It was the fourth failure ,it nearly made me go to pieces! Despite that, I will do it again tomorrow. I will never give up!
May God bless me!

A bad day !

Today is a bad day for me !My experiment was failed again! The experiment have cost me nearly a month. After the first failure, I am trying to get the possible reason of the failure ,and do it again ,but failed again ,again and again ,It is the forth failure ,it nearly make me go to pieces ! Despite of it，I will do it again tomorrow ,I will never give up !God bless me !

一些其他建议：

cost是不是更侧重于表示“花费钱”，如果我写的话我可能会写It has taken me almost one month to do the experiment.或者I've spent almost one month on the experiment.

In spite of = Desipte，好像没有Despite of。