"I would like to know if any member of this support forum knows why Big Pharma has not produced a drug to lower high blood pressure based on the ingredients used for Erectile Dysfunction,which help your blood circulation?"

They have - this is one of many.  Besides the stated use below, it also lowers blood pressure.

http://www.drugs.com/isosorbide_mononitrate.html

What is isosorbide mononitrate?

Isosorbide mononitrate belongs to a group of drugs called nitrates. It dilates (widens) blood vessels, making it easier for blood to flow through them and easier for the heart to pump.

Isosorbide mononitrate is used to prevent angina attacks (chest pain).

Isosorbide mononitrate will not treat an angina attack that has already begun.

Isosorbide mononitrate may also be used for purposes not listed in this medication guide.