It's better you remove your impacted tooth. You should have removed it even before  doing rct for the previous tooth. The wisdom teeth is cross direction it might give pressure over your rct tooth which will appear as if it's pain in rct tooth. While caping for rct tooth your wisdom tooth might have got damaged a little bit which will result in the type of pain which you are experiencing. It's better to remove the wisdom tooth

Can't see the rct tooth clearly in the xray the impacted tooth seems to have been decayed

Need to see if the rct is proper. Anyway do get your impacted tooth removed since that would cause food judgement and decay of the rc treated tooth again. The wisdom tooth looks decayed too