Meltdowns- Feeling like a horrible mother

My baby turns a month today. It has been great so far, except for those random fuzzy days. He doesn't really cry much, but when he decides he wants to be fuzzy... OMG! He will be doing great all day, and as soon as 8pm hits, he gets into this mood where he just feels the need to fight his sleep. Every day I give him his bath around that time, massage him, feed him, read him a story, and sing him bedtime songs until he falls asleep. He seems to enjoy this and doesn't fuzz or anything UNTIL  he does fall asleep, and I stop singing. Then he wakes up and cries, stops and cries, stops and cries... Like 10 second intervals. He has this new thing where he also arches his back resisting comforting. I try EVERYTHING possible! I mean... Check off the whole list and still nothing. Does this until he is so tired that he wears himself out (which usually takes about 2 hours). I get to a point where I am feeling so tired and helpless, that I start talking to him and asking him what's wrong (in a firm tone of voice) as if he were going to understand and answer me! Usually goes like "what is it? What do you want? I've tried everything! Just stop! Please!! Stop!" And then I proceed to crying and apologizing to him because I feel like a horrible mother for getting frustrated with him. This has happened like 4-5 times since he was born.