You need to get a criminal defense attorney ASAP. You are the target of an investigation in a federal criminal case. DO NOT SPEAK WITH THE DEA until you have legal counsel. You are under no obligation to do so. This is true even if they come to your home. Questioning you without your having a lawyer is to their benefit. You could easily and unknowingly say something incriminating about yourself or someone else regarding the investigation. They can be threatening and intimidating. They can also come off as caring and concerned. No matter what, do not talk to them without having a lawyer present.