Someone please help me! I've posted this so many times but I'm literally at the end of my tether…

Someone please help me! I've posted this so many times but I'm literally at the end of my tether now! Albie will sleep in his travel cot/ cot for everyone else but me and tom! He sleeps through all night for every one but us! I've tried since he was 5 months to get him in his own cot it never worked he screamed until he was sick! So i brought the travel cot in our room and he will wake up as soon as I put him down in it no matter how much of a deep sleep he is in it's like he knows he is with us like I said everyone else he will sleep alone bar with us! I can't co sleep anymore 1- I have sciatica and it's only getting worse 2- we don't have a sex life 3- i know the longer I leave it the worse it will get! I have tried everything you can imagine! I'm a nanny I've taught mothers how to get their child to sleep yet when it comes to mine I'm having no luck like I said he doesn't stop crying I've tried the cry out method and it's got to the point he stops breathing and makes himself sick! I've got in wth him! I've put him in half way as well as fully asleep! Do I just pay for a sleep nanny because I can't think of anything else now 😭 someone help me!!!! I should also add he was In a crib from a newborn but I used tom BF and would get him in with me through the night for a easier life and clearly I've made it worse!