18 Month Sleep Regression - HELP !!!!!?

Hi - I have a good routine with my 18 month old and have sleep trained him to put himself to sleep in the evening. He has never been a great sleeper waking at leaste once a night but easily resettled and a minute later back to sleep. He has done a complete turn around and cries when I leave him and wakes from 11pm hourly till dawn breaks. I am at my wits end trying very hard not to stick him in our bed (although this seems way easier but its one place I like to call our own and my hubby agrees). I have read there is an actual phase called 18 month sleep regression - my question is how did you deal with this and how long did it last. Its been almost 2 weeks and he is better when going to sleep but last night he started his nonsense from 10pm :( I am trying to be patient and sensitive to his needs in the time of sleep regression as i dont believe he is just being naughty or maybe he is ... i dont know any more. I have resorted to cosleeping but in his own room and soon as he is sleeping i put him back into his cot and i keep doing this through out the night trying very hard not to create more sleep problems. Any advice or constructive critism welcome :)