Hi hon, sorry it's taken me so long to reply.
Lots of (((hugs)))
I don't think you really want to do CC, but I know how frustrating sleep training can sometimes be and that temptation is there (my DS2 is such a screamer and I had a hard time getting him to settle that sometimes I felt like screaming in his face... it's really awful and difficult
). But, even though you feel like you can't do anything to help him, your presence is helping him know you're not abandoning him and will be there with him while he learns how to do this, even if you're just reassuring him with your voice.
In case you need a little more encouragement not to go down the CC route, have a read through these links...
Re: Research on why 'cry it out' and 'controlled crying' is NOT recommended!Cry it out (CIO): 10 reasons why it is not for usIf he's used to going down after 2.5hr A, I think jumping right to 3hr might be a little much. An old and wise mod on here would advise to start with where you are (2.5hr A) for 3 days. If you're still getting short naps or it's taking him a long time to settle, than add 15min. If things are still the same, add 15min more. It's ususally a gradual process, rather than a big jump.
I also think you need to remind yourself to have realistic expectations. I know he's been doing well with going down drowsy at BT, but what you're describing is very normal for the first few days of sleep training at naps. There's often a lot of crying and some missed naps. But, if you stick with it and are very consistent, the crying will get less and the naps will get longer. I know it's one of the least fun things to do, but it is always worth it in the end.
More (((hugs))), hang in there... it will get better!