Berries, I'm not a professional, but this is my take on your 'voices' telling you to get off your meds.

I'm a firm follower of the theories of Arthur Janov, and he maintains that everyone carries around with them certain primal 'pains' or traumas which are usually in a state of repression. Drugs ( especially drugs used for MI) aid in this repression , holding the pain down. It doesn't cure, but helps you cope as you are temporarily numbed from feeling pain.

Your body's natural instinct is to heal. The process of healing emotional 'trapped' pain is through experiencing the repressed pain and releasing it. This is scary, and for those of us who have experienced much pain in our lives through abuse etc, can be dangerous leading to psychotic episodes if all the pain is allowed to bubble up all at once. Being on our own , alone with our thoughts allows our pain to bubble up and we start to feel anxiety as the pain surfaces. So we tend to keep our selves busy, keeping the pain quelled.

My feelings about your voices are that they are not at all insane, but you are sensitive to your bodies natural instinct to want you to feel ( and thus cleanse)yourself of repressed trauma. You are not faking your MI, but then again most of us experience MI at some point in our lives because we are all sentient beings and subject to feeling hurt.
So I say to you, be kind to yourself and maybe consider that those voices aren't actually the enemy, they may just be your friend, but a friend who is a little bit misinformed.

Do not stop taking your meds as it can be dangerous to do the cold turkey thing. But maybe consider some talking therapy in conjunction with your meds to allow some of your pain to surface safely.

I wish you strength in your journey to mental health.