SSRI: Does insomnia every go away?

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I started taking Zoloft last Friday for anxiety/panic and every night since I've had issues staying asleep. I usually find myself waking up around 4-5am.

I also have loss of appetite and almost always the feeling of a small lump in throat like I had when I had anxiety attacks.

Has anyone else had this issue with the medication when they first started taking it and does it go away?