I so can relate to the frustration you describe. I'm sorry to hear you are having to contend with this.
Some of my friends who think they know about my MI, think they knew how it affected me, told me how I should be doing things, or how I should pursue treatment; I had and have to wonder because at times I do not even understand my MI myself, how can anyone else KNOW?! Really, how can they know?! I do however appreciate some of their attempts which may be surprising, despite how awkward as these attempts are, as I have since learned they are trying to relate to me and to understand what I am going through; they are trying in the only way they know to be there for me, despite CLEARLY having no idea how to be. Though it may not turn out to be the most helpful way, they do try. So I now appreciate even the unhelpful/"bad" attempts; they are not therapists and neither am I, both trying to sort it all out but we are only human and unfortunately mistakes are a given. It would be nice if all knew what was most helpful but no one is perfect. However, if we do know what can do to help, we can explain this to our friends and family with the hope they will be there to listen, take it in, learn from each other, and go from there, ideally. Unfortunately, it is not always the case that they will listen and take what we say to heart and so, true friends begin to show.

It has taken a lot of patience, time, and courage to let them in as to what is really going on so they do understand and so they are not left to make bad assumptions. I am sending you the courage for the same patience and perseverence in standing up and caring for yourself while helping others to understand. It is worth it in the end. Hang in there!