My little one did this (now 4 weeks old tomorrow) and I resorted to the bottle (expressing breast milk and formula - about half and half). My evenings are better although definitely support the 'witching hour' theory. The only thing is, my little one is just active and whingy.
He did 'feed' from 7pm until 11pm, midnight, 1am or in one case 3:45am!!!!! It was physically and emotionally exhausting. I didn't have the will power to continue and I was heading towards depression (past history).
I found my MWs unsupportive - more like lecturing, making me feel like a bad mum because his mouth wasn't on my boob (one said no to express!) whereas a female registrar at the hospital (another story!) and my GP (will admit to being male) said that babies often use the breast as a comfort rather than a feed.
When I stopped the breast contact, my little boy was able to have good feeds (4oz sometimes 5oz) at regular 3-4 hourly periods. He is absolutely thriving now.
Some people believe that you can't bond with your newborn in the same way as you can breast feeding. YOU CAN! I sometimes have skin to skin when bottle feeding, lots of kisses and cuddles and he can also enjoy the same bonding with his dad.
Breast feeding isn't for everyone but I would certainly advise to persevere as much as you can and do not beat yourself up if you want to change things. Our lives are very different to how they used to be and whereas breast feeding can be easy for some, it isn't for others.