You can (and probably should...) continue taking the ADHD meds (ritalin /. concerta?) when discontinuing the hydrocodone.........amphetamines used to be prescribed for the fatigue from opiate withdrawal. Its still a valid medical thing, but I doubt that you would find a Physician that would agree to it these days.
I don't have advice so much as words of encouragement...
Be thankful that you caught this PROBLEM early. You did have a high dosage, but you were only on them for less than 3 months. Some people have been on opiates for years and that just makes it so hard to get through withdrawals.
I think if you're prescribed for something, then you should probably take them, but I am no doctor this is just my opinion.
Hang in there, this will pass. You are a strong person for going cold turkey and realizing that you have a problem. Just take it one day at a time, and before you know it, you'll have stopped counting the days you've been clean. Good luck.