larlylou, I've just returned from Canada, and my local health authority pretty much poo-poo the "colic is caused by wind' theory. There's a fair bit of medical evidence to storngly suggest that "colicky" babies have no more wind in their systems than calm babies. However, colicky babies cry more, so potentially injest air, giving mums and dads the impression that their baby is windy.
Reflux, however, is another story and should be ruled out by a GP before you read on...........
We were all steered toward a book called "The Happiest Baby on the Block" by Dr Harvey Karp. He describes why and how to calm a screaming teeny baby by something he calls the "5 S's".
Swaddling - make sure the arms are locked down. I never tucked in DS's feet.
Side/Stomach - crying babies freak out if you try to calm them by holding them with their back facing down
SSSSSH! - making LOUD, white noise sounds mimics blood flow in the uterus. It must match the volume of the baby's crying. Saying SShhh in the baby's ear worked with my DS, but some people need the hoover on, or a hairdryer, dishwasher, bathroom fan etc.
Swing - waltzing with your baby stimulates the vestibular system. Ie go back and forward and up and down. Those vibrating baby swings are supposed to be ace. An electronic toothbrush wrapped in a towel and placed on the baby's stomach is also supposed to be quite soothing (never tried it).
Suck - only when your baby has started to calm down - allow her to suck - boob, dummy etc etc.
To start with, you'll probably find that this sort of crying comes in 3 to 4 cycles over 15 mins, before your baby completely relaxes - that's when you let them suck (I seem to remember the Baby Whisperer giving a good demo of this).
Don't worry if your baby completely fights the swaddle - just quickly continue on with the other S's.
This sort of "purple" crying reaches a peak at 6 weeks old. We started the 5 S's when DS was 4 weeks old and we thankfully never noticed it getting any worse. By 8 weeks, all we had to do was loosely wrap him in a swaddle and he would immediately stop crying.
We used a commercial swaddle called the Miracle Blanket. The seams are quite thick though, so make sure it is completely flat down your baby's back, with no bumps.
DS was in a swaddle pretty much 24/7 until he was 9 weeks old.
Good luck - this sort of crying is awful. Sometimes I had to lay DS is his cot and walk away as I was worried I was going to throw him against the wall. it really pushes you to the edge. It will pass!!