I hate to say this, but there are many reasons that you should accept your partner’s decision and let it go. Whether or not your actions were under your control, the emotional damage caused by it is the same. Your very presence can be a trigger now, perhaps even triggering other past trauma that’s worse. And how can your partner know that you’ll never be wrongly medicated again and act the same way?
Any pressure you apply to fix things will likely only make things worse. If there’s any chance of a future, you must accept the present without trying to control it. Give your partner the freedom to work this out without the stress of also working out the relationship or even feeling obligated to do so.
Take the “if you love someone, set them free” approach on this one. Just as you are not 100% responsible for your actions, your partner is not 100% responsible for reacting to it in a self protecting way. Be as understanding as you want your partner to be.