Dear Sau-Nig (nickname),
I will clarify about Rahu in 6<SUP>th</SUP> or 7<SUP>th</SUP>. In your preference of planet calculation either manual or using software, if you have chosen true node, you will get (in your case) Rahu in 6<SUP>th</SUP> house but if in preference, you have chosen mean node, you will get Rahu in the 7<SUP>th</SUP> house.
To rectify this matter, as you are running Rahu from year 2000-2018, describe your experience as far as important events or “The lesson” you have leant during this period. Once you relate your experience, we can be sure either we want to use 6<SUP>th</SUP> Rahu or 7<SUP>th</SUP> Rahu and prescribe remedy accordingly if you encountered any anguish.
Another thing, why you need to to any remedy if nothing is really bothering you.
Extra knowledge for you:
If you go deeper into Dasa system of prediction in Vedic Astrology, you will find Vimshottri Dasa is one of the 10’s of Dasa system prescribed by Maharishi Parasara. So here, how we are very sure that, just because in Vimshottri Dasa system is Rahu, it will indicate or relate to something about Rahu. At the same time, Vimsottari Dasa, in spite of such a large number of Dasa Systems existing in astrological treatises, at present remains the most popular and universally acceptable system which has been giving very precise results.
Best of luck,
Bhaaskaran at brv62002@gmail.com