Welcome to HCM!
Aftre reading your query I can say from my clinical experience that the decision to go on a diet is good.
In his diet he should go for -->>
-bland/ low salt/ non spicy foods.
-Taking curd will really help him,
-stick too small frequent meals, and
- adequate hydration
- add more of salad and fruits in his diet, espically Avla, tomatoes, colored vegetables( to improve appetite)
-Cut down oil in diet as much as you can for some time
-taking an antacid
, like rabiperazole before meals twice a day will help in digestion
I don't know what all medicines he has been prescribed and what are the results of his investigations, as they are not mentioned. but if you had provided them they would have helped in telling exactly how he should move forward.
For burning urinary tract
and anus, I think one needs to do a urine examination plus culture, to rule out infection. If already done and normal, this can be related to spicy food or inadequte water consumption.
changing the diet will certainly help.
He should also start to walk and try to remain busy and cheerful.
Hope he gets well soon!
feel free to ask more queries
Dr . Manisha Gopal