I'm no expert at this but wanted to send you a big hug..
One thing I found really helpful was establishing a good bedtime routine. It doesn't have to be fancy, in our case at that age (ds is now 2.5yo) it was bath, pyjamas, cuddle time, bed. It helped have a quiet end to the day and also ds knew what was coming next. The fact that you've had some success until sickness set in shows all is not lost!
I have to say, I have no great feelings for or against dummies, ds still has one but he only gets it at night and can find it himself so I'm not too worried as to whether he should or shouldn't have it...if it works, fine by me!
Could you slowly water down the night feeds? If he's not really hungry it strikes me as habit and one thing my hv suggested to me was water down the feed a bit at a time until ds worked out it really wasn't worth waking up for. I wasn't sure whether you put him down at night in your bed and he falls asleep or whether you have to stay with him - maybe you've tried moving a little further away from the bed every couple of nights until you're out of the room? I haven't tried that technique so maybe someone else could phrase it a lot better than me.
Good luck, let me know how you get on, hope I haven't talked a load of nonsense at you!