Hi JulianosMom
Well I think that what has happened is your DS has learnt a sleep association - that in order for him to fall asleep he must be in your arms. So what is happening is when he stirs during the night (all babies come in and out of sleep during the night) he realises he is not in your arms and cries out to you to come and pick him up because he doesn't know how to go back to sleep unless you are holding him.
Also teething often does interupt night sleep but I think that the sleep association is the bigger issue for you.
What you need to try and do is get DS used to falling asleep without his prop (YOU!). The other thing you might like to try is an earlier bedtime - 8.30pm is quite late for a 10 mo. Usually babies at that age go to sleep around 7 or 7.30. If DS is overtired that will not be helping him drifting off to sleep.
So, how do you break the prop that has been developed? I would suggest that you start gradually placing DS in the crib sooner and sooner, first just before he drifts off to sleep then when he is a little more awake, so on and so on - so that he is still calm and relaxed when you place him in the bed but that he learns that it is where he will be if he wakes up during the night.
I would suggest you have a look at two other boards on this forum - the Props Board, where you will find out information about gradually weaning props, and the Pick Up Put Down board, which is a method Tracy recommends for using when you are trying to change those sleep associations.
HTH, please let us know how you get on
Jo