Sweety, it really broke my heart to read what you wrote. be good to yourself, we are all doing the best we can and so do you. You are raising three children for god's sake, you should be proud of yourself.
I don't seem to really understand if you want to wean him from feeding to sleep. There is no right answer BTW, I just want to know if that is what you want us to help you with.
If you do want that he learns to be more an independent sleeper then what you could do is this:
It's pretty normal for a BF baby to still NF at 5 months. So lets say that you pick 2 times during the night that you would feed him, lets say for the sake of the example midnight and 4. If he wakes up before that you don't feed and just pat/shh, try to settle him back to sleep. I suggest you don't rock him because then you start a new prop.
When midnight comes you feed and same goes to 4AM. Whatever NW he has other than these two wakings you just try to settle.
I am not going to lie to you, you might have some rough nights, but it will get better and after a while you could get some sleep yourself
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Shh/pat takes time to implement. You do shh/pat for 15min and then cave in and feed him you are confusing him and will make hardly any progress.
Are you using white noise? Many mommies find it helps, including myself.
The other thing is not to rush in too soon. When he fusses at night don't go straight away to him, don't go in if he is mantra crying because he is trying to sooth himself. You can go in when you hear that "I need you now" cry and shh/pat.
Here are a few sample routines:
http://babywhispererforums.com/index.php?topic=164029.0Saying all that I say, it's my suggestion but I am not in your shoes and don't know what would be realistic for you if you are doing it all alone.
Can you DH help? Maybe pick a time that he is at home like the weekend to help you with the shh/pat?
(((Hugs))) coming your way.