Hi C.,
My daughter Natasha at the age of 4-10 months was colicky after 4pm- till she fell asleep. Nothing settled her, I tried nursing, music, bouncing, swinging- everything. The only thing that would settle her was my husband or I holding her till she cried herself to sleep, and she would cry for hours.
I was frantic for answers, my husband and I were on the verge of a nervous breakdown, we turned to our Pediatrician for help. Our Dr. suggested establishing a good nighttime routine around her fussy period, give her an early dinner, bath, another bottle or nurse, then have her in bed by 6 pm. Make her room cool, very dark and have soothing music or some type of white noise in the background at bedtime. We did this and she still cried, but our Dr. told us to allow her to cry in her crib and every 10-15 minutes, go in w/out turning on the lights and with minimal talking, pick her up, soothe her, rock her for 5-10 minutes, and then put her back to bed. Also, to continue to allow her to cry and to do the 10-15 minute check in until she fell asleep. Well, we did this for about 2 weeks, till one day after her usual bed time routine, I put her down at 6:30-7pm, she cried 5 minutes and was asleep till 6am the next morning.
My daughter Natasha is now 3 yrs. old and has no issues going to bed, except now we can't get her to go to sleep by 7pm, it is more like 8pm :) We still have the same type of bed time routine, but we cut the music thing and read books instead.
I don't know if this is something you would like to try. I do know it wasn't instant relief for us, but we established a good nighttime routine and eventually she learned to settle herself to sleep.
Please let me know how things worked out for you. I would love to hear back from you. I now have a second child, another girl- 1 month old. So far, she is a dream baby, sleeps and eats. Hopefully she continues to be so easy. Sincerely, R.