My baby has severe colic and was prescribed Levsin Drops, Has anyone used these?

My daughter has a pretty serious case of colic, and to top it off she actually has a molar coming in and she's only 7 and a half weeks old! I couldn't believe it. Needless to say she's been feeling pretty miserable lately. She will only sleep when she's being held or put in her swing or car seat, and will only relax when she's given tylenol or is being bounced in my arms or on my knee. So as a result I have slept 15 minutes to 3 hours a night for the last 3 weeks. With a few all nighters in between. I honestly don't know how I'm functioning right now, I'm just so run down. I've tried everything to help her sleep and stop crying. Swaddling, shushing, warm baths, Mylicon, The Happiest Baby On The Block, you name it and I've probably tried it. Her pediatrician prescribed an antispasmodic (Levsin Drops) to help her relax and sleep, but I've been doing some reading online and I'm feeling a little hesitant to give her Belladonna because the possible side effects seem so serious. I'm tempted to just try and survive the next few weeks on my own but I was wondering if anyone on Y!A had tried Levsin and what there experience was. If you've tried them did they work? Did your baby have any side effects? Would you recommend them? Thanks!