Thanks for your query.
From the information provided, your problems are suggestive of a condition called "defecation pre-syncope".
There is a transient reduction in flow of the blood to the heart due to increased pressure generated during straining. Consequently, blood supply to the brain is momentary reduced, causing transient dizziness
or even fainting
A strong laxative till constipation
is completely relieved; avoidance of straining; high fiber diet and plenty of water intake, will cure the problem.
Consult your doctor and apprise him of my opinion. I am certain that he will agree with me, and will prescribe suitable treatment as advised.
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Fond regards and have a nice day
Dr. Rakesh Karanwal