Toxic working environment how you doing?

My workplace is toxic. I want to resign and go back Malaysia but face difficult time due to commitment. My husband doesn't want me resign and left him behind in Singapore. I currently pregnant with our 1st child (4 months pregnant)and our financial not stable.i felt my mind all over the place and start to lose sleep cause of situation at workplace. Tried to bear it for few months because I don't want burden my husband but I feel I start losing myself. sometimes I will woke up crying and imagine in my head shooting myself or hang myself. Today I decided to give my resign letter even I aware it will impact our lives and I feel bad that I not strong enough to work and fight for our future. Mind share you guys experience or better solutions ?

3 am.can I still be happy after this? Can I heal?