Halacha from the Heart

I hope to visit Israel this summer. Should I say “morid hatal” in Shemoneh Esrei like Israelis, and should I continue to say Baruch Hashem L’olam at Ma’ariv?

Is it permitted to ingest homeopathic remedies on Shabbat?

Could you please explain how to handle the transition from Shabbat into Tisha B’Av (when it falls on Motzaei Shabbat) regarding se’uda shlishit, Havdala, and changing clothes?

Can performing a mitzvah be a liability? What is hataras nedarim? How does Kol Nidrei work?

Can performing a mitzvah become a liability? What does it mean that I am doing something “bli neder”? “My friend Billy Nader says bli neder on almost everything. Is this being too frum?”

I work in a cemetery on upkeep in the area of the graves. May I listen to Torah shiurim with earphones on site?