you could add some potatoes in there, which will bulk it up & 'absorb' some of the spices.
You could also add some nuts, raisins, apricots (fresh or dried) that again will 'dilute' the flavours.
If it's too lemony tasting, add some sugar but only a little bit.
You could also add some chicken stock & more of other vegetables that you've already added.
You could pre cook everything and then stir it in at the end if the chicken is already cooked & you don't want it to fall apart.
Good luck - I'm coming round for my tea xxx