Things which render the Salaah Makrooh

Performing salaah with a distance between musallis and with a mask

Q: Prayers are offered in Masajid these days with distances between musallees being about one meter and leaving the alternate saff empty. Also, we need to wear a thin mask during prayers. This way the nose does not get in contact with the ground.

1. Are our prayers valid with distances in between?

2. Are our prayers valid with a face mask on? 

Performing salaah while having the urge to relieve oneself

Q:

1. Could you please tell me what to do when I come across a situation where I have to relieve myself (in the bathroom) at that time of salaah (especially fajr and magrib). Should I control myself and make wudhu and go to the masjid for salah or should I go to the bathroom and then go to the masjid and read salah without jamat?

2. What are the situations in which delaying salah is permissible, because when it comes to salah and I have a situation like that, then I get tensed and get a headache and my heart starts beating fast.