Employment issue

Good Morning, I have been fairly new to this disorder. My employment is what is concerning me. I don't like anyone knowing about this problem, I feel it is personal. Unfortunately, I had a massive seizure at work this past summer. Lost consciousness, don't remember the whole day, co-workers called ambulance, went to ER. This was horrible. So everyone at work now knows. My issue is that as with most employment, we have a policy in place that if you must take off work due to illness, a call must be placed 30 minutes prior to shift start time. Yesturday morning, I don't know exactly when I had another seizure. Again the whole day is a blank. Now of course I am in trouble for not calling in. Any suggestions on how I should be handling this? I don't want to lose my job, and now I am really scared that I am likely to be fired due to this disorder. Prior to yesturday, my boss let me know that this is an "issue". By this he meant any seizure activity. It feels to me like my boss and co-workers seem to feel I have some sort of control over this... The environment here is the sort where over time is expected and if you are sick you come to work. Some of you may say, why don't you find another job. I am in a mid-size Canadian city at a telco job, which is fairly specific to the industry. I have been applying for jobs within the company, but now that I have had a seizure at work - this comes up in interviews. I am sure this has at lot to do with why I cannot seem to even be able to transfer never mind advance. Any advise? I really need some... Thank you, Jill