Doctors are pushing this stuff like candy for anything and everything. After being prescribed massive doses of seroquel for insomnia and panic disorder brought on by withdrawal, I have forever lost trust in doctors. My opinion is that it is NOT a good long term option for serious anxiety issues in people who are not psychotic. In regards to insomnia issues, I think that you could find something safer. Hell, I'd take a benzo to get to bed before going anywhere near seroquel ever again. It felt threatening to my mental health, it's more than just a generic sedative. There was some freaky shit going on.
This stuff simply does not work for panic attacks. It turned me into a pharmacy hopping zombie who was working his way up to a gram a day of the stuff, with the doc letting me know that was perfectly fine. If I needed more then I could have as much as I wanted, not to worry there are no side effects. I should have known what was going on (I was becoming a pill popper and it wasn't even medicating me, it was making me worse) but I was too much of a zombie at the time and it took a while to snap out of it and seek the proper alternatives. And I was still getting the panic attacks, I turned to the bottle back then. So I was on seroquel and I was drinking again. I was out of my mind, it's supposed to be anti-psychotic (?) well it was making me fucking BONKERS. I had a pretty shitty withdrawal too, it's addictive - I basically didn't sleep for a week and had to taper off, and this was after less than 6 months of use. When I managed to get shuteye I had night terrors, sleep paralysis, lucid dreams, and extremely vivid, uncomfortable nightmares during the seroquel withdrawal.
I also heard that long term use can cause involuntary muscle movements. A big step forward was the realization that my doctor was not helping me, and that I should eschew this wrongly prescribed drug forever.
But then again this drug is meant for people with schizophrenia. I am not that. I'm just saying that it's overprescribed and it sure as hell is no wonder drug. It did help me for a couple of months with the anxiety and I was sleeping like a baby but then it completely stopped working and I turned into a pill popping maniac for a while. And it took me too long to realize that it was not helping me whatsoever anymore and something very dangerous was going on. It was my first experience with prescription drugs. Strange phase of my life.