mental illness ruining marriage

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I am taking medication but it doesn't seem to be helping.  I have no insurance at the moment and I'm not sure what to do.  I am always irritated and short tempered.  I have to hold everything back from not screaming.  I can't control my emotions.  I have a 6 month old baby.  I just want to yell at my husband and I am constantly stressed and tired.  I keep apologizing to my husband and not doing anything to change it.  I don't know what to do    Please help me.   I can't help my self.