I've been having a similar thing with Angus plus pulling off the breast and screaming. I just got out The Wonder Weeks and lo and behold 14-15 weeks is the start of the fussy period for Wonder Week 19. The unsettled sleeping, extra need for mum and change in appetite are major signs that they are growing developmentally again. I too have been worried about what I've been eating (and actually getting him tested for allergies tomorrow) but hopefully it is just this period. I'm not looking forward to the next few weeks but at least I know it's normal and am now feeling less anxious. Hang in there!