What to do if i'm 58 years old man, before 25 days i was found with widal positive but after 25 days widal test is negative?

Ignore it: Widal is an outdated test for typhoid fever. Unless you traveled to a poor country with poor sanitation, you are unlikely to have typhoid fever. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.