Ashok suffered from ME, or Chronic Fatigue Syndrome, around 25 years ago when he was studying at Cambridge University. Through neurological research that he conducted, he managed to get himself 100% better. He then set up a clinic to treat others, and then published the well-known recovery program known as the Gupta Program in 2007.
Interview with the creator of a Long Covid Recovery Program (Gupta) in an academic journal
A good look at the research behind Gupta, elements of the program, tips for recovery and a chance to know whether you may like to try the Gupta program. He says to exhaust medical examination and then, "Once the doctor has said, 'Look, we’ve done as much as we can for you,' then you come to our program and look at the underlying wiring of the brain."