As tough as it is right now, you might have to take him for emergency care. If he is coughing/vomiting so much that he loses control of bodily functions and is unable to eat and generally take care of himself, he should be seen sooner rather than later.Are the headaches coming before or just after the other symptoms? Bad migraines can present with nausea and vomiting, and sometimes neurological complaints, as well.It's hard to tell more without seeing full labs and imaging, again, pointing to getting some answers quicker by going to an ER.
He doesn't use drugs and has no known food allergies. He was able to eat breakfast today, and so far it hasn't come back up, though he is coughing. I feel overwhelmed by these responses but appreciative. I'm worried about going to the ER because our area is having a huge COVID surge and hospitals are at capacity. Is it safe to wait? Where is best to go?