Well withdrawal is going to cause a lot of anxiety and insomnia and the way you've been doing it is not helping you. Best thing is to just quit.
The medical detox (it can most likely be done inexpensively at home) is of course the way to go - that would be my first recommendation, always see the doc.
It's going to be miserable, no matter how you cut it. Been there, anyone who has quit has gone through it - if we can you can.