Welcome to HCM!
After reading your query I can say from my clinical experience that it looks like a case of gastritis/
gastroenteritis.
Had I been treating you I would go for routine
blood test. I have found that a course of antibiotic, eg., cephalosporins, for three to five days, along with a good
antacid, and antiemetic will help in handling the infection and taking care of
nausea, and pain in abdomen. for head ache you may take
paracetamol 650 mg.
It will be very helpful to avoid any kind of oily and spicy food, preffrably eat at home only.
Taking an antacids , like rabiperazole , half hour before meals will help you in eating food without much problem.
For about. a week, eat small and frequent meals, start with may be few spoons at a time and the increase the amount gradually. This will help your stomach and bowel to adjust back to normal eating habit.
Hope you get well soon!
Feel free to ask more questions
Dr. Manisha Gopal