Taking 12.5-25mg for last week or two for insomnia. If I don't take it at night, I don't fall asleep. Can I be dependent already?

I should preface this with I suffer from anxiety and my insomnia is as a result of this. So I am on effexor and bupropion for anxiety, and I am also pregnant. So ideally I want to be on ZERO medication, but unfortunately I need it. Last time just after Christmas my anxiety and insomnia came back, and I was pulling all nighters without trying. I went on a few medications and over the 8 months I had to do trial and error until I found out effexor and bupropion worked for me- no more insomnia.

FF to this Christmas season, and I guess from overthinking about how I went through that around the same time last year, and worrying if it'll happen, of course my insomnia comes back. So normally I can take half a gravol and sleep perfectly at night. But this week nothing seems to work. Not gravol, not melatonin, nothing. My psychiatrist prescribed me Seroquel this past summer to use for sleep, and I only used it on an as needed basis. But this past week it is the only thing that puts me to sleep. If I don't take anything I am up till 3am, at which point I just go and take the Seroquel to fall asleep, which I do.

Do you think you can become dependent on the Seroquel for sleep after only a week or two? I know I need it to sleep right now but I also worry that stopping it will cause rebound insomnia, which will be counter productive. Any opinions or tips?

Signed, an anxious pregnant woman.