M.,
I'm curious as to why you don't think it's colic. My first son had colic (BAD) and it sounds a LOT like what you described. Let me yell this here for those that tell you, YOU CANNOT SPOIL AN 8 WEEK OLD BY HOLDING HER. She needs you, you are her comfort and security. Also, letting her cry at 8 weeks is too early. I'm not for or against CIO, I do what I'm comfortable with and respect others choices to do the same. But, 8 weeks is too early to try it - IMHO.
My older son spent a LOT of time sleeping in my arms with the Boppy around my waist. I spent a lot of time sleeping upright on our couch that way. He refused to be comforted by anyone else except me. Add to it that I was breastfeeding and I was one stressed Mama! I tried the baby sling and I must have been delerious with exhaustion, because I couldn't figure it out. Lol. I wish I could have, though.
Swaddling worked well with him, too. But he spent a lot of time sleeping in the swing or in his bouncy chair. It seems that the propped up, cuddled feeling worked well for those times when we needed it. He's a great sleeper now in his own bed and on a great schedule (he's 2.5 yrs).
Finally, is she spitting up a lot? When you lay her down is she squirming in pain? If so, I'd look into what you are feeding her. If you are breastfeeding, are you taking in caffiene? I BF both sons and was a saint with son #1. But with son #2, I bent the rules a little bit and indulged in some iced tea. I noticed when I had more that one glass it had an effect on my normally content and sleepy baby. If you are using formula, it may be a good idea to consider changing brands.
Finally, she's not sleeping enough during the day. Ten minutes 2-3 times a day isn't enough. She should be napping more than that. How long is she sleeping at night? Even if she's a GREAT sleeper at night, she should be napping a lot during the day at 8 weeks. Our first son was very sensitive to stimulating things and people. He hated being in crowds and screamed the whole time at family gatherings with my in-laws (there are a lot of them). To get her to nap more during the day, make sure the TV is off and she is in a quiet, comfortable area. Does she take a pacifier? That may help comfort and soothe her.
Sorry I was so long winded here. Just trying to help you out as I went through the SAME thing! Good luck, and IF it is colic, you will be amazed as to how it just stops at about 12 weeks. It sounds terrible, but I wasn't able to enjoy being a Mom until about then.
Good luck.
T.