If you feel like you are being pulled towards Hecate and asked for a sign from Her, then I think it is very likely that she reached out to you through your dreams @sarah29 
As for Clear Quartz, I agree with what Mary said- that (one, medical care should always come first- especially for any serious issues! 
) and two, that Clear Quartz is known to have healing properties!
Francisco shared the following about Clear Quartz:
Perhaps @Christina4, @Missa, and other crystal experts in the forum will have some additional advice for you about this crystal 
Hoping that your husband and son heal quickly- wishing them both a speedy return to heath! 
And wishing you all the best as you continue to deepen your bond with Hecate. Blessed be! 