Am I permitted to perform more than one prayer within single ablution?
You are permitted to pray as many as you could within one ablution and to recite Quran so long as your ablution isn't nullified.
Is it permissible to swear by (Allah ”The Living”)?
Yes, it is permissible because “ The Living “ is one of Allah`s Attributes.
Is it permissible for a woman to visit the doctor while in her `Iddah(waiting period)?
It is permissible for her to do that during day time, but it is impermissible for her to go out at night except for a sound reason.
What is the ruling on exchanging kisses and hugs between husband and wife during the day in Ramadan?
Praise be to Allah the Lord of the Worlds.
It is disliked to kiss one`s wife during the day in Ramadan, and it is recommended to avoid that. And Allah the Almighty knows best.