can mold make you sick???
molds can cause some extremely serious illnesses including some that lead to death. This is not something to be lax about in seeking attention for, especially since you appear to have several symptoms that are often associated with toxic mold infections.
google "toxic mold symptoms" and you will find a plethora of sites that speak to the problem.
Call your are health department and ask about mold test kits.
Do NOT go into the area. In fact, it would be a good idea if you could leave the residence until you are certain it is safe.
Now, due to legalities concerning real estate, you should have been given a disclosure form from the seller when you bought the place. 4 years is a long time to try to make a claim but due to the apparent intentional actions to conceal a problem, it may be considered fraud if he did not disclose a known roof problem and it may extend or remove any applicable statutes of limitations.
Along with the doctor and the health department, you might want to consult with an attorney that specializes in real estate law.