There are no antidepressant medications that will induce tempoary insanity, so that you would shoplift. In most cases an insanity defense doesn't work. Sometimes a defense is, not guilty by reason of brief psychotic episode. However, when you further explain that you have an Autistic child and suicidal tendencieies it is possible that you also have an Autism Spectrum disorder, as these run in families, one of which might cause you to react differently than expected to medications and to have certain belief systems and communication and social problems.
You need to do several things:
1. See your psychiatrist and report the type of activities, your feelings and reactions since being on the medication, also ask for evaluation for Autism Spectrum Disorders including, Asperger's Syndrome which affects persons with normal to high intelligence. If some other doctor other than a psychiatrist is providing the antidepressant Rx, do the same and ask for a referal to a psychiatrist. You will need a letter from the doctor/s re your diagnosis and treatment.
2. Retain an attorney or request an attorney, a public defender if you cannot afford one to handle your defense, they can defend you and possibly negoiate a deferred judgement or diversion program for you.
3. Contact your court and ask re the ADA coordinator. Explain your entire situation, your disability and that you are primary caregiver for a disabled child. There are limits to what ADA accommodations can be used, for example, you may feel more comfortable reading or answering your questions in writing, or more time to answer, or to have the questions explained if you don't understand. You might also ask for a continuance to have more time to respond to the citation.
It is important to be honest. that is how people can help you and that when you communicate with others, that you understand them and they understand you. Don't say you understand somehting if you do not.
It is important that you pay for things when shopping and that if you can't or don't want to pay for something, put the item back, the same rules of society also apply to you, even if you have mental illness or a disability.