We've had the stairgate on Oscar's door for when he plays alone there in the mornings anyway, so the gate is not new to him. Also, I don;t think he feels abandoned as he's always slept alone and in his cot anyway,....
Now things are a lot and I mean A LOT better for us. Has not left bed all weekend after going down both nap and bedtime. We are bribing him with his toy...he is allowed take a toy to bed (within reason, a little train or a car for example) and gets to choose before bathtime which toy it will be for the night....this is a real treat for him and the toy is taken away if he gets out or even makes a move towards the gap beyond the bedrail....
Oscar is a trying, spirited boy and this bribery may sound cruel but it is teaching him that it is important to stay in bed once tired ( till fri when we started the toy trick he was literally unconscious when he finally remained in bed and in the meantime just kept walking out, up to 20 times before falling asleep).
Also with the stairgate.....I think it is a reminder for them of their "cot-ted" past and they go as close to it...or to their main caregivers.... as possible. Oscar has never been left to "cry it out" and actually in these past two weeks has only started whinging once completely exhausted at the gate....he has really been having "fun" getting in and out...and only being able to go as far as the door is a good boundary-teacher for him!
good luck with the next little while....I ws also about to give up as the two hour putdowns were really started to eat into our evenings and causing huge frustration on my part as it was mainly me who dealt with it.....
take care and keep in touch!
Siobhain x