Sertraline as a second anti depressant - safe to take two together?

[sertralineworry]

Has anyone ever done this? Psychiatrist advised it, to take a low dose of sertraline plus a higher dose of mirtazapine (been on that for hour years) - one in morning and one at night. Started the sertraline today - took 90 mins ago - and feel a bit weird. Headache, shivery and spaced out. Psychiatrist warned there’s a slight risk of serotonin syndrome and cardiac issues, which has me a bit worried!

https://www.drugs.com/drug-interactions/mirtazapine-with-zoloft-1640-0-2057-1348.html

Yeah that’s what the psychiatrist said, that there’s some risk of that syndrome happening. Said it would usually happen pretty quickly. Apart from feeling sleepy, blurred vision and headache I haven’t got anything else on that list thankfully. I think I’m just worrying myself into feeling unwell.

The doctor wouldn't prescribe it if they didn't think it was a good idea
I would just try it and if you have any side effects obviously let them know