I think whatever you try you have to give that idea at least a week to see how it works. NOTHING will work in just one day.
I feel you though, my DS did this, woke around 7-8 times a night and was ready to go at 6am! It was hell.
I would do the following-
BF- one first thing in the morning, one mid day and one just before bed. Get this established for a week then impliment the following
Bedtime. After dinner at 5-5:30pm, quiet play time, stories, TV if you allow it, but only for a short 15 minute age appropriate burst. ITNG saved us. Up to a bath at just before 7, then into bedroom, lots of kisses and cuddles, stories, dim lights night time BF.
Then pop off the breast, if asleep, gently rouse. If not, cuddle, kisses, little night time song- same one every night. Into cot. Lay down, rub tummy. Sit on bed. When/if your baby starts to cry, say calmly "its OK, its bedtime, shhhh, I will rub your tummy" Rub tummy, for a minute, and repeat. This time move slightly out the room. Basically each time you want to move farther and farther out of the room with each tummy rub and lay down. Be calm and be firm. Try it for a week.
It is a variation of gradual retreat.
I did CC initially to get my DS to sleep better, and it worked. But it was hard and I NEVER thought I would do that. I guess there just comes a time...
However it unravelled a but for us and we went with Gradual Retreat instead. The Millpond Sleep Clinic Book and website was really helpful I found.
While you are going through this, can I suggest ear plugs for your DH and 15 year old? 