Antidepressants

I started Trintellix, I think similar to an SSRI, a couple weeks ago and tempted to stop. I’m scared it’s going to worsen my sleep problems. I can’t afford to mirtazapine and quivivig combined are hardly getting me sleep. Im scared or having to get off mirtazapine also as I hear the withdrawals are horrendous. I’m breaking down badly. My body hurts my brain doesn’t function. What do I do? I’m losing it. :( losing my life.