How much gabapentin are you taking? A better combo than gabapentin+clonazepam is gabapentin, clonidine, diazepam and perhaps another sleep aid and muscle relaxer. I found baclofen to work better than gabapentin coming off buprenorphine.
You can always try an outpatient methadone detox program for a month to ease yourself more comfortably off the buprenorphine. That would work fairly well for your needs, working and all.
That said, comfort meds are your best friend here. As are any and all stress reduction techniques you can engage with.
Can you take some time off from work for the holidays to try and focus on your health?
Frankly, if you're feeling horrible I'd just take a small dose of buprenorphine. Cut your last 0.5mg into 5-10 doses and take one of those. Keep those around for whenever you need them, and as long as you just keep reducing the dose (both in terms of time between doses and quantify of each dose) you'll get where you want to be a little easier.
I'd seriously consider using methadone through a clinic for a month long detox program though. That would be the most comfortable way to get over this if comfort meds aren't helping. Perhaps try the correct comfort meds before going that route, but don't discount methadone just because of its poor reputation. The vast majority of that is basically abstinence only myths and drug war propaganda.