You can create a questionnaire on the subject you are interested in for conducting your own research, based on the material available on the Internet. Such a questionnaire should be submitted for review to a specialist of your choice, and after a positive review, you can use it.
David Kryszajtys Thank you for your response. I saw this article but there is no information about the questionnaire itself. I have requested for access it to it but I do not have it yet.
Pozdniakova M.A. Thank you for your response. I want a questionnaire on self-management. I will like to use one that is already validated instead of creating one as I do not have so much time left.
Giuliana Murfet Thank you for your response. I checked the site but I didn't find a suitable one. I will keep checking.
It will depend on your focus as there are ones for e.g. obesity, alcohol, diabetes etc. Some very basic ones are PHQ-9 or GAD-7. If you map out your focus it might help to draw you to the right tool. DASS is a emotional health/self-management assessment tool for diabetes. Google Self-Management Support in Behavioral Health: Organizational Assessment Tool | Resources for Integrated Care and see if they suggest something.