Can Diabetes Cause Stress,depression,anxiety And Tiredness?

This is out of despiration. I think i might have diabetes. My history. 2007 i was diagnosed with severe depression, I have a stress and anxiety problem. The last 3 years, i have been very tired, and it only gets worser and worser. All of the docters just gave me vitamins. I tried to sleep more and less but did nt work. I am currently in gr12. In the morning classes until about 10 o clock i fall asleep in the classes even in tests while i write. I realised that i continue to write even when i am asleep. Because i can feel when i wake up suddenly, then i cant remember writing the things i did. I even sometimes dream when sleeping in class while working. I sleep most of the times in the afternoon after school, because then i am so tired i can t concentrate on my home work. When nobody wakes me, i will sleep for 3hours or more without waking up. But i try to sleep only an hour or less in the day. There are days that i am so tired, that my heart starts to pound when i climb the stairs, and it feel that my legs are going to give in under me, and then i am out of breath but not so that any one can notice, i can only feel it. I have never fainted in my life, and are not over or under wheight. My eating habits is good, and i eat 4 times a day. About a month ago, i was diagnosed with low blood preassure, i am on medication and it went well for a week or 2. Full of energy, now that i am back at school and my blood preasure is normal its the same again. It is starting to influence my school work. The reasons why i think i might have diabetes is my symtoms are tiredness, frequent bladder infections but not serious, heart pouding, my hands and feet sweat very much in winter. I dont really sweat. When i dont drink my vitamin c pills i get sores in my mouth and throught. I am despirate to get help. We dont have an medical aid so tests must be limited. kathleen (19)