Analysis
-you slowed down perhaps you are EXHAUSTED
-you checked the time after heavy trainings
-you trained hard,but perhaps you don't have a daily routine
-you should have a planned training schedule and WORK IT OUT EVERY TIME
-ensure you are running at your SMOOTHEST FORM
-time is just an indicator,forget about the time temporary
-5 months is only a short period,you still have a long way to go
-everyone's performance is fluctuated,when you get poor results today,it doesn't mean that you won't get strong tomorrow.train harder and you will get better times
-i'd experienced your situation.I started to run in 3 years ago when i was running 14.3 secs.after 2 years of training,I managed to run 12.3 secs last year.but i slowed down to 13 secs this year,and i found it was my running form that slowed down myself.so i trained to run with better techniques and I got 11.4 secs now:)
-sorry i'm unable 2 type chinese
-this is my sharing,hope you'll like it...and gd luck;)