This has gone on for 8 months and you have not seen a doctor? It sounds like more than heat stroke. You should be assessed by a medical professional to get an answer for this. No one here can examine you and see your medical charts.
It would appear the main focus of the damage is in the speech and language area of the brain but I could be wrong . Have they done tests to determine how severe the damage was in that area before they diagnosed you with conversion disorder? Have they related a certain trigger for their diagnosis for conversion disorder or are they just giving up and giving that as a diagnosis. Have you had a rehabilitation therapist work with you extensively to try and have another part of your brain take over and try and compensate for the damage done from the heat stroke? Because even with conversion disorder, rehabilitation therapy can be invaluable. I want to say how sorry I am for this frustrating and difficult time in your life. These things take time. Answer any questions in comments and I'll try and help more .