Withdrawals!

So I am having the worst withdrawal from trying to taper from 30mg a day. I have been taking it exactly as prescribed since February. I tried to do 5mg drop to 25mg and for 6days had severe anxiety, restless, insomnia I feel like I'm super sensitive? I'm on gabapentin and Cymbalta can that make withdrawal harder? My problem is the insomnia is severe. I don't know if I should drop by 2.5mg instead? My prescription is 10mg tabs so what would I do split it in quarters? What would a taper schedule look like if I was to do it really long and slow? I feel completely drained and fucked I just want off this medication.