Ah bless, Not much help but im the similar position but getting abit more sleep.. My bf DS is 5.5mth, he was sleeping though but not any more, up every 3hrs. Ive been feeding him as thought mayb hungry but thats prob wrong! My little boy has little sleep in day, prob total of 2hrs..
My DD did the same at that age - we did gradual retreat (google it or buy the no cry sleep solution), with my DH going into see her it worked took a month to work and worked for 3 months and then never again. Resorted to CC at 12 months (generally not advised earlier) worked in 2 nights.
My DS also 6 months old -wakes every 4 hours, but not fed to sleep and has only slept through twice in his life. I'm at my wits end of what to do. I have a toddler to look after during the day but sleep when the baby sleeps if you can and it does make life easier.
It does feel like you are being tortured by your baby.
You poor thing - that's sleep deprivation at it's worst. the no cry sleep solution could help but I've heard it can take a long time to make it work. Sounds like you may not have the energy....
If you have the cash you might consider hiring a trouble shooter maternity nurse for a couple of days. I'll probably get criticised for suggesting this but I've known people who have done it and it's worked. If you're that sleep deprived it might be worth considering. The thing to keep in mind is that whatever routine/advice the maternity nurse gives you - if itworks you have to do it consistently.