Going for hajj while paying off a mortgage

Q: I would like to go for hajj and we have enough money for my husband and I to go but we have a house mortgage that we took 7 years ago ( I understand it is not allowed to take interest based mortgage but I was then advised by a local Mufti Saheb in England that as there are no other options and I had been paying rent for so many years it would be permissible as not for business purpose and purpose is to live in the house). I do not have enough money to pay it off but have enough for hajj. It will take me at least another 5 years to pay the mortgage off. Do we need to postpone hajj and pay off the mortgage first or can we go for hajj first?

Leaving the Musjid with the left foot

Q: Is there any hadith with reference which states it is sunnah to enter the Masjid with the right foot and leave the Masjid with the left foot? If there isn't any hadith which states one should leave the Masjid with the left foot, is it permissible and better to leave the Masjid with the right ​foot if one intends to do something good when leaving the Masjid?

Fantasizing about other women

Q: I am married to my cousin (mother's side) 6 years ago.This was a pure arranged marriage and neither of us had any likeness apart from the fact that we were cousins before marriage. We both try to make salaah on time and we take care of each other as well.

My question is that what does Islam say if a husband has no physical attraction towards his wife despite so much efforts to feel attracted to her but still no feelings. During intercourse he only gets aroused sexually by imaging other women. Otherwise its not possible for him to get arouse sexually.

Kindly guide me what to do as this is killing me from inside. I don't know how long I can live like this. Besides this we have no arguments and no fights. She takes good care of me and I do the same, but it's only this one thing and it's happening for more than 5 years. What should I do?