I’m feeling terrible. Was OK for a couple of days but now the side effects have come back. Nausea, knot in stomach, my anxiety is higher and have loss of appetite. My doctor suggested swapping to mirtazapine but I'm weary of taking these. Do I stay on the sertraline a bit longer and hope side effects improve? I've been off work 4 weeks already and got 2 children to look after. Thanks.