What is the interpretation of the supplicant's feeling of relief/comfort when performing Istikhara for marriage to a specific woman, despite not receiving an answer in his Istikhara regarding mending his home or divorce?

The feeling of ease after performing istikhara is a sign of good. One should consider the welfare of the two daughters and the impact of divorce on them. If it is possible to patiently work on reforming the wife and involve some wise individuals for mediation, then the continuation of the marriage might be better. However, if reforming her is impossible and her harm is unbearable, then divorce is more appropriate, based on the saying of the Prophet, peace and blessings be upon him: "Three supplicate to Allah, but their supplication is not answered: a man who had a bad-tempered wife but did not divorce her..." And because the continuation of marriage might become pure corruption and unadulterated harm.