I agree with wakeonyourown above. You have been thru quite alot and suffered a major loss and you have our sympathy for your loss and what you are enduring. Anyone going thru this, regardless of their age, would be going thru just as bad a time as you are right now.
Excessive worry would be quite common in your situation and there is no need to concern yourself about schizophrenia.
I don't know if you are religious or not but now would be a good time to speak with a priest or minister you know or even a school counselor or someone you trust, to just talk over everything you are going thru and all your fears and concerns.
Life sometimes hit us with some heavy blows unfortunately but we endure them, learn from them, and move on as best we can. Don't be afraid to ask for help.
God bless!
Its understandable to be feeling crappy, especially with all of the stuff that you have been through lately. I highly doubt you have anything to worry about concerning schizophrenia - as far as I know, anxiety and schizophrenia are two different ball parks. Don't worry yourself sick over things like this. Just worry about dealing with what is going on now for you and focus on coping with the major stresses in your life at this moment.