don't forget you can manifest heal if you really need it
Wait... is that why manifest doesn't work? How do I manifest?
go to the "perks" section. you'll see an option called "manifest" under the "drain" perk (the red square). the you scroll down until you see the upgrade you want to buy (in this case, it's heal). then you buy it with the star. hope it helps :D
I just bought the game by the time I saw this comment thanks!