When I was on xanax, 15mg. and klonopin, 8mg (st high doses), I was pretty sick. I first went started with the xanax and then started going down on the klonopin. I did it in a hospital program for truama and they realized how dangerous the doses were. It took 8 years for me to try another benzo after how awful the withdrawal was. I stayed on other meds, added some & took some away as well.
What you describe is perfectly normal. You mmay also have very vivd dreams when you do sleep, which can be hard. You may also feel physical aches and pain. Vomiting is not uncommon. It should last about 2 weeks.
Other symptoms: metallic taste, nervous feelings, insomnia, loss of appetite, nausea & vomiting, tinglilling feelings, headache (you mentionsed that), increased perspiration, poor concentration, tired and sluggishness.