Yes, a Return to Sender spell is a good idea.
You can also use a mirror for a “bounce-back” spell. For example:
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Prepare some Moon Water tonight (there’s a waning moon which helps).
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Tomorrow use the water to cleanse the mirror.
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Light a black candle and use the mirror to reflect the candle flame.
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Meditate to ground yourself. Say:
“Moonlight, cleanse this mirror of all negativity.
Empower it to reflect back to the source, any and all negative energy.
Charge this mirror to return any harmful spell to its sender, times three.
Blessed Be”
- Snuff out the candle and place your charged mirror facing the direction where you feel the negativity coming from. e.g. a window.
Leave it to work and see how it feels.
Good Luck and Many Blessings to You! 