ehow has lots of info on Hydrocodone withdrawal and what you can do to mitigate the effects:

Depression
Hydrocodone withdrawal patients usually feel severe depression after cessation of the drug. Depression is treated through psychotherapy, but it can also be treated with diet and exercise. Depression is one of the most difficult withdrawal symptoms, because patients want to return to the drug use. It can also be treated with vitamins, especially vitamin B6. This is known to increase mood by increasing serotonin levels in the brain.

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they also mention taking Benedryl for the insomnia. i've done that for going off my anti-depressant as it was said to really help with a lot of the withdrawal effects. but ask your doc since you are on other drugs as well.

hang in there mixed. you are going thru major drug withdrawal. it does get better but go in the hospital if you need to. this is major stuff as your docs had you on very strong, addictive drugs.