Hey I wanted to make this a class but you can not make classes so I made it a sorcery subclass please give feedback if it is too strong or too weak 

https://www.dndbeyond.com/homebrew/creations/view?entityTypeId=789467139&id=2657814

It has some issues.Here are the two glaring ones that popped out at me right away.

At level 20, with the Tough Origin Feat, and 20 Con, you would have an average of 282 hit points. That means you could not even cast one each of level 8 & 9 spells before your hit points were completely reduced.

If not restricted, this subclass would be ridiculous multiclass fodder for martial classes like the Barbarian. Barbarian 5/Sorcerer 15 with this subclass would have a ridiculous amount of survivability (especially an Aasimar Wild Heart Barbarian with resistance to everything except Psychic and Force damage).

It's a cool concept, but it needs some tweaking to be viable.

you are slightly wrong you would have 322 health with the tough feat and 282 health with out it but you are right that it might be slightly to much health how about this 

• 1st-level: 13 hit points
• 2nd-level: 17  hit points
• 3rd-level: 25  hit points
• 4th-level: 35 hit points
• 5th-level: 50 hit points
• 6th-level: 74 hit points
• 7th-level: 85 hit points
• 8th-level: 115 hit points
• 9th-level: 163 hit points

and this subclass is all about spamming lower spells with your tons of hp instead of casting the bigger spells