How do you cope?
Baby is 5months.
Used to sleep 6-7 hours in a stretch. Now wakes frequently and screams until I breastfeed him back to sleep. On typical night he goes to bed at 8pm and wakes to feed at 10pm, 1am, 3am, 4am, 5am and is up for day around 6-7am
By the time I've got back to sleep each time he's waking up again!
I feel like I'm going mad. I keep shouting at him at 5am 

He has 3x30min naps during day.
Should I start sleep-training? What if he's hungry? Has anyone tried CC? Or is this just a regression/growth spurt that I need to ride out?
Also his wee has a strong smell since his sleep went haywire, he's also drooling all day, could he be teething/thirsty?
Any tips for coping with sleep deprivation?