L.,
I know it's hard to hear your little one cry for you at night, but it is ok to let your baby cry it out. You will go through some painful nights at first, but eventually they will learn to soothe themselves on their own, and all family members will eventually enjoy night-time versus dread it. Plus, your baby will get a better night sleep too!! Try instilling a nightly bedtime routine. I have 2 girls (ages 3 yrs & 14 months). For our 14 month old we do a bath every night, then bottle, and then we lay our baby in her crib while she is awake, but drowsy.
My first child we always ran to her when she cried. Finally, at 14 months of age, and my husband & I being exhausted, we decided to try the "cry it out" method. For about a week or 2 she cried (almost screamed) at times for us. We would go in about every 5 or 10 minutes and tell her it's night-night time and lay her back down, and eventually she would give up. The first night she went to sleep without crying we were so happy!! Now she is 3 years old and has been a wonderful sleeper ever since. We had an adjustment when we transferred her to a big girl bed, but we applied the same method using a baby gate on her bedroom door. After a week or 2, it worked again.
Our 2nd child, we applied the same method since infancy. As soon as we noticed she was tired, we laid her in her crib. We have never had any sleep issues with her, and she is now 14 months old, and I think a very happy baby because she gets good sleep.
I hope everything works out with you. Good luck!!, and just try to remember, she can't cry forever.