Lets move back to your main question ?
Does jeevanvidya nullifies bad effects of it??
Yes sir , jeevanvidya guides to come out from all kind of bad effects.
As Jeevanvidya is based on low of nature and Thought power.
If person are not aware of Thought power and how to change / mold thought
Then it is possible that surrounding affects his thought chain.
Which will lead him to get good or bad results, depending upon your thought nature.
So first of all no need to change vastu, just do prathana and haripath in vastu regularly.
If you think problem is big then ask your friends , relatives to join you in Prathana jap yadya .
you can ask Jeevanvidya people ( Nearby shakha ) they will also come and do prathana ( This is not req any money ) we will not charge any thing for this.
This will help you to turn your thoughts in positive direction.
You can get more information on Thought power in ?AMRUT MANTHAN? in Sankar Mhanto tahastu chapter.
Thanks Please feel free to ask

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Thanks