Difficulty in performing wudhu and salaah due to ill-health

Q: I have many health problems including back pain, incontinence, tiredness, mentally and physically weak, etc. I spend most of the time resting on the bed. Doing wudhu and praying 5 times is very difficult for me. I feel unwell most of the time, doing wudu, praying salah take very long time and I become tired and stressed out.

I don't know any Muslim doctor to ask this and no one else can help me do wudu. Because my illnesses like back pain, tiredness go worse by wudu and praying, can I do tayammum instead of wudu? And pray salah sitting? I tried doing tayammum and pray sitting but still I struggle.

Conversing with Rasulullah (sallallahu alaihi wasallam) and sharing one's thoughts at the Rawdah Mubarak

Q: Is it permissible to converse with Rasulullah ﷺ, share one's thoughts, etc at the Rawdah Mubarak, considering that Nabi ﷺ is hayaat (alive) and will be able to hear one from that vicinity or is it only restricted to salaam and request for intercession?

Purchasing airtime advance

Q: Is it permissible to take out airtime advance with networks such as Vodacom and MTN?

Your account gets credited with airtime and you don't pay right away, but you are charged an extra service fee to get the airtime as you do not have to pay for it right away?

Are the children of one's adopted father's second wife mahrams?

Q: I'm adopted by my parents. My adopted mother then breastfed me so they became my foster parents. In 2021, my mother (foster mother) passed away and my father got married to another woman. She already has three children. Are they mahraam to me? Should I have to make purdah from them? Is it permissible to marry them at the same time?

Woman revealing her satr for cosmetic surgery

Q: I need a fatwa regarding treating a female patient by a male doctor in a surgery.

Actually the procedure is cosmetic surgery for droopy eyelids and the male surgeon said that we will take skin from your inner thighs. So I want to ask about the draping procedure and all the male staff along with female staff with male doctors are present.

Is it allowed to expose your body infront of men in the presence of females?

Ash'ari and Maturidi beliefs

Q: I want to enquire regarding Ash'ari and Maturidi theology/beliefs. What do they entail and why do we (اهل السنة والجماعة) follow these imams?

What beliefs of these do we follow as Ahnaaf/Shawafi?

How does following them tie into following the madhaahib?

Is there any detailed books on this authored by reliable authors?