Hello Dave I have been on 30mg of mirtazapine> I'm now reducing to 15mg and hopefully to none. I have put on loads of weight with this med. However my psychiatrist used it as an add on to complement other meds that I'm on. Go back and talk to either your GP or Pdoc and tell them that you are still feeling rough on 30mg. I would allow two to three weeks to allow your body to get used to the higher dose. I would still go to discuss your options. They might want to add in something else as well to help with the anxiety. I also take valium to help with my withdrawal symptoms. I agree that valium is addictive and hard to withdraw from but then so is mirtazapine. I hope it all goes well for you.