Sorry to hear about your issues in marriage life. Depression and stress related issues could have lead to back pain. Comprehensive physical therapy program to address your pain and stiffness would be beneficial for you with goal of helping you get back to your yoga schedule.
Next Steps
See a Physio Therapist soon
Health Tips
Without increasing your pain, do light walking, spend time out doors. Seek some assistance from support groups , family or friends to cope up with your depression.