Day 2 - Why am I struggling so much now?

Last week everything went almost perfect. I made it to day 7 before I screwed up and now this week has been so frustrating. I've jerked off every day from Sunday to Wednesday, only on Thursday did I snap out and am somewhat back on track now. But I still had urges all morning. Fuck my stupid brain and fuck this stupid addiction. Been doing this for four weeks now and couldn't get past day 7, I hate myself.