100 heavy armor is a long way away.  What you really want to solve the sneaking issue is the Muffled Movement perk at 30 sneak (50% noise from armor) and the Muffle spell from illusion.

The survival issue is simple - don't dual wield.  Add a shield and you will live.

Stamina isn't a big deal if you spend a handful of level ups on it and get the Restoration(40) perk - Respite (Healing spells also restore stamina).