Lost a baby 5 months ago have been on mirtazapine 4 years now in the last month I have been having crying spells every day should I up the dose?

Grief Counseling. I am so sorry to read of your loss. It is unlikely increasing Mirtazapine alone will be enough. Your tears are telling you it is time to get the help you deserve. Talk therapy and a possible better medicine can help tremendously but this is not something you do alone. This time will always have meaning but life will unfold in a better way with the right help. Reach out now to providers and call.