Ouch! Big sympathy. I have been there, its rough.
How is he going off to sleep at the beginning of the night? If you can get that straightened out it will probably help the rest of the night too.. At 7 months babies are usually capable of going through the night without a feed (although try telling them that!) so it is probably that he's got used to you feeding him to sleep and needs it to go back off when he wakes in the night..
He's still pretty young though, too young for any more than the gentlest of sleep training IMO..
However if you feel up to trying something, this worked for us with DD1 at around the same age:
You put in place a nice consistent early (7ish) bedtime routine (bath, bf, story/lullaby, bed) then put him into bed sleepy but awake. The idea is for him to drift off without being fed or rocked or cuddled to sleep. This means when he wakes up in the night he won't need to be fed or rocked or cuddled back to sleep.
If he protests going into bed awake because he's used to drifting off on the boob or in your arms, you sit with him and stroke his tummy and reassure him and sing to him til he goes off. If you do this night after night (it will prob take a week or so) he should get the idea, and know that the bath / story / bed routine ends in him going to sleep and just do it automatically.
Yes he will probably cry at first if he isn't used to going to sleep this way, but he will be crying out of frustration because his normal sleep associations aren't there and he hasn't yet built up new ones, not because he is hurt or scared. You will be there to soothe him through it.
HOWEVER the first few nights are crucial, you have to be prepared to be strong and resist the crying, and not crack half way through and go back to old methods. DD1 cried for 1.5hrs the first night we did this. I sang 100 Green bottles sitting on the wall right down to no green bottles, while stroking her tummy. I think I was half way bonkers by the end. But it worked and the next night was 10mins of crying, and then no minutes and she was a much happier baby for it. And at no point did I leave her on her own to cry, which I was glad of.
HTH