Afraid for a friend...

[KuriLing]

-Level 42 main scenario, he's level 44
-Doesn't have the situational awareness
-He can't take the hits
-He's got mobility issues in his hands

This explains everything, sadly to say your friend needs to switch to another class if he's having all of this issues, you need mobility and situational awareness if you're using a DRG, or any melee. Having issues with your hands while playing as a melee...it's 100% a no go, he needs to change.

-basement for the MSQ in Ishgard
-5 mobs.
-Caster, healer, three melee

And this is another reason why you need situational awareness and the easy steps to kill for any class:
Healer > Range > Melee > Tank
And you're basically done, simple. Healers are the number 1 go to kill-off list, any range should also be killed because they are squishy, melees even though they hit hard, still need to move in order to hit, and tanks for obvious reasons because they don't hit hard.