There are tons of pharmacies that are open that you can call. Walgreens, Walmart, even some in grocery stores. That way you can be sure.
You can also google Zoloft and see what their website says. There are a lot of places to find this information.
My hubby takes Zoloft and has been for some time. He has taken Nyquil and had no side effects. Nyquil no longer works for me since they took out the Sudafed and replaced it with the fake Sudafed. That stuff does not do anything for me except make my heart race and palpitate. It does nothing for the congestion.
I take real Sudafed for sinus congestion and stay away from the combination drugs that have stuff I do not need.
I hope you get feeling better soon, having a cold does not feel good.