I've been driven to posting on the one thread I hoped...PRAYED...I wouldn't have to.
My DS is formula fed. Had been sleeping well (9-4 then again til 6/7 after feed). I would wake every day feeling refreshed and happy, and ready to attend to my 'needy' boy during the day. Not 'needy' in the sense of crying, etc. (he actually rarely properly cries) but in the sense that he has never been a big napper and grumbles and grizzles if he's not getting 100% attention. After a VERY rough first month (borderline PND, harmful thoughts, etc.) I was starting to feel human again and actually enjoy my son. We had some major issues with wind early on too but these seemed to resolve themselves.
He turned 14 weeks on Saturday. He was 2 weeks overdue, so effectively 16 weeks from his due date. He has started 'sleeping' horribly. I'm still settling him down to bed at 8 and he's still drifting off around 8.45. So he CAN get himself to sleep. But whereas he used to then sleep til 3/4am he's now waking at 11. Then 12. Then 1. Then 2 (which is usually when I relent and feed him). Then, if I'm lucky he'll drift off until 5. If I then drag him into bed with me (he's in a snuzpod) I might get another hour out of him. Oh, and the wind (farting and leg thumping) has returned with a vengeance too, despite having made no changes to his formula.
I thought it might just be the odd night, but it's now been EVERY NIGHT for the last 5 days, so a definite pattern of sleep fuckery is emerging. None of my friends' babies had this so was praying I'd dodge it too. Should've known!
Am starting to feel the old symptoms returning; short temper, tearfulness, feelings of just wanting to walk away and leave him. And that's just after 5 days. What if this goes on for months!? 
And I can't sleep when he sleeps during the day because he just doesn't. Never has really. And because he's now not sleeping at night either my happy, docile, placid little man is rapidly becoming an angry zombie during the day which is wearing me even thinner. At least the first few rough weeks DH was on paternity leave and could help out, now I'm flying solo- it's not fair to expect him to lose out on sleep (although he often offers) because he has to be vaguely switched on for work.
So. Here I am. In the one place I hoped I'd never be. No offence. 