Were you just crying that one day or has it been happening to you frequently lately? Sounds like you may be in a bipolar depression. Could be that your medications are not right for you. Have you considered talking to your pdoc about taking another look at your medications?

That would be unfortunate to have a roommate who would go to the length of calling an ambulance just because you happen to be crying. Sounds like she really cares though and just may not know what else to do.