I chip in here because I know your symptoms all too well. And I have been to India too in the past (among many other places).
What you describe seems to me a case of microscopic parasites, like Amoebia or Giardia. Yes, they can be responsible for all of your pains and ailments. Especially if you have been a carrier for them for a long time.
I had Giardia several times in the long past, but then, I was lucky enough to have an old-school specialist in tropical deseases on my side. For him, drops of fat in stool samples was a clear indication for the existence of this type of parasite. In his diagnosis, he even jugded the smell of stoll samples - apart from his microscopic work as well, of course.
He has retired a couple of years ago. And now, having been to tropical countries again and falling sick there too, I haven't found another doctor able or willing to help.
Your current symptoms are mine too. It got a lot better after 4 rounds of Humaworm, but I'm still not where I want to be again.
Do the cleanses Dr. Bailey recommends. It all may take time, but it will help.
As a note: about two years ago, I took Fasygin (against Giardia) despite negative results from stoll samples. Two weeks after, I suddenly felt so much better, I couldn't believe it. It lasted for anothder two weeks only, unfortunately. Since then I learned that there are strains of Giardia that are resistant to traditional medical treatment (Fasygin, Flagyl). Bad news. But as you did, I found Humaworm by researching possible reasons for this illness and possible treatments.
I wish the chemical stuff would have worked as it did in the past. Because it was a quick fix, or so it seemed. Now I have tackle this all differently. As I'm not a very patient person, long-term treatment is not something I had in mind. But I do now, and I got better, day ba day.