I think the smell you are talking about is related to a heightened stress response. I'm pretty sure cold sweats are largely a result of the limbic system(the part of your brain that regulates autonomic functions like body temp and heart rate) "misfiring". I don't think it's from sweating out a metabolite of the drugs, otherwise the smell would be present from the beginning of use. In my experience, it's because I'm sweating in a nervous or stressed kind of way. It's not a sweat like you get from exercise, more like the sweat you get from embarrassment or extreme nervousness, which I understand to be a result of the body struggling to regulate emotion without the drugs.
If you are having that bad of insomnia, it might not be a bad idea to take a nightly dose. You can keep the dose at .5 for a few nights then drop it to .25 for a few nights, then start going every other night if that is going smoothly. Then every 2-3 days for a week, then only as needed for 2 weeks then nothing at all. That way you can plan that in 1 month you will be free from all drugs AND no acute withdrawal symptoms. You can go quicker than that, like you are, but from the sound of it you are just entering some mild benzo WD. The alpha blocker (clonidine?) might have some mild WDs as well, like increased heart rate and restlessness.
Then again, if you can fall asleep, your able to eat and hold food down, no nausea, vomiting, or diarrhea, and aren't crawling out of your skin with anxiety, you'll probably be ok with cold turkey. It'll be difficult to say exactly what is opioid WD, and what might be benzo/alpha blocker wd at this point. Beta and alpha blockers are said to both require tapering to safely get off them, at around 10% per step down. They regulate your heart rate and immediate cessation can cause problems as well.
How are your vitals? Because you weren't on them for a long time, you probably don't need to do the 10% taper, however it might be wise to do a rapid taper so the abrupt stop isn't such a huge shock to your body.