I just wanted to post this in case it helps someone.

After being on Seroquel (50 mg) for a couple of months, taking the medication before bed, and after noticing I've started relying on and reaching for Klonopin again, I've decided to take half a 25 mg tablet in the morning/before going out/a stressful situation. The verdict: it sedates, works differently to Klonopin, but it SIGNIFICANTLY reduces the likelihood of panic attacks, and if those do happen, they're shorter than usual for me.

Overall, I prefer Klonopin to Seroquel, but the latter isn't addictive and is healthier in general. I'd definitely recommend it to anyone who's been advised to take it by their doctor, or to whoever's thinking about treating anxiety with anti-psychotics.