Add oil!! all mama here had gone through these ups and downs. Don't suspect you don't have enough milk, your body will adjust the milk production once you bb is born. As long as you have the patience and trust yourself and the bb, you both will do better and better. I was so frustrated in the first 1.5months too because my bb was always crying for no reason but after i found out cos she was lack of security, so i hold her all the time and feed her (give comfort) when she needs.
And don't forget you just give birth and is very normal your hormones had dropped dramatically and hence you get distressed so easily. Is not a big deal at all, just give confidence to yourself, you can do it, add oil!!