does anyone take seroquel as needed for sleep/anxiety?

I had one session with a psychiatrist and was prescribed 25mg — I tried to make another appointment and she didn’t have any available times that worked for me so I told the office to just forget it and thanks anyways kind of thing. Since I knew I wasn’t seeing her again and wouldn’t be prescribed more, I stopped taking it but then a month later that same dr sent another script for 90 days. I’m supposed to up the dose to 50mg after 1 week so she assumed I would be doing that and sent me 25mg but double the pills that I got in the first bottle. I’m not sure if she will send more next month so I’m afraid to up the dose or take it every day just in case this is all I have