First I just want to tell you that I feel for you and hurt just reading through all that you are going through. You mentioned that some mingt think you were dumb for feeling truly upset and even suicidal over this issue- I don't think that your feelings are stupid or that it is dumb to feel the way you do because of school and being overwhelmed.
In my own way, even though I don't know exactly what you are feeling, I can relate. I believe that with all the other things you have said, you are feeling overwhelmed- at the same time maybe like you are failing at something - that must add to your painful mood.
You have every right to feel this way, I think it is understandable, but I don't think you are a failure, that you are dumb, and I am sorry that you are feeling bad about yourself on top of everything else.
As for finding some relief emotionally and being able to stay in school? (because that seem to be what you want if I understand you right?) I am wondering if there is a school counselor/advisor you can talk to.
Many colleges and universities now have (and are required to have) programs in place to help students who are having problems like you are describing. Those who have these programs and even many who don't are willing to work with you to make things more manageable.
I had to enter into one of these programs at the college where I attended for two years. I couldn't seem to keep from getting overwhelmed (and having a long list of problems that would have had me quit immediately had it not been for the help I got). They helped me a lot.
Maybe you could find out what type of help your college might offer to you? I don't know you that well or your situation ... but I do know that no matter how hard it can sometimes be to ask for help...the worst thing that can happen when you do ask for help is that you are no better off than when you started. Yet, there is always hope that if you ask you will get hope...
I would almost guarantee that your school has programs and other things in place that will help and lessen the mental/emotional burden or that at the least they will be willing to work something out with you.
I really hope what I have told you helps. Hang in there ok? If you want to ask me any questions about this or if you want to talk to me about anything, please don't hesitate to send me a private message.