Toddler Sleep Help!

My son is going through a separation anxiety phase. He is 19 months old. He is refusing naps in his crib during the day, I end up laying down with him on my bed to get him to nap. He also takes ridiculously long at night to settle down to sleep, and if I’m not in there while he falls asleep he becomes hysterical. He also wakes at least two times a night inconsolable unless i pick him up. We have tried the Ferber method and the fading technique, and nothing is helping.. does anyone have any advice?! We are exhausted and at a loss of what to do... :(