All right here's what I've got - It's gonna be a 12 day taper and it's going to require you to split your pills up quite a bit. First take 4 of your pills and cut them each up in 1 20mg part and 1 10 mg part. Then, take the remainder of your pills and cut them up into 5 mg parts. After you do this you should have 4 20 mg fragments, 4 10 mg fragments, and 12 5 mg parts. Know, for the first 4 days of your taper stabilize your dose at 1 20 mg fragment and 1 5 mg fragment each day. The 4 days after that, move down into 1 10 mg fragment and 1 5mg fragment each day. The 4 days after that, move down to 1 5 mg fragment each day. After that stop using completely. Now, you may be wondering why the doses of this taper are so small when compared to your usual dosage and the answer for this is two-fold: firstly, your remaining supply isn't that large, and from my experience a lesser dosage of opiates is required to alleviate psychological symptoms, like anxiety(which you have), than to stop physical symptoms, like diarrhea and the chills(why you don't seem to have to any distressing extent).
This plan will probably be easy to follow from a physical standpoint, but you have to keep track of yourself psychologically while doing this. Do some activities to relieve your anxiety like meditating or taking a short nap. I personally find that running or doing some other form of exercise for at least half an hour a day is great for slowing down your frenzied mind and helping you calm down. if you have trouble sleeping because of the anxiety, check out sublingual melatonin at your pharmacy. If you are still having anxiety or depression two weeks after completing this taper, it may be indicative of some non-substance related psychological issues or imbalances. As for your question in the previous comment, taking even a short break in between opioid usage can help prevent tolerance from rising too fast, but I don't know if it has anything to do with the different types of w/d symptoms that you experience when you quit. Best of luck, and if you can keep us posted on your progress with either a post or a PM.