Ah, yeah, that low health will cause problems against some bosses. You might boost it fairly high with reagent potions though... try using, in order, a Tomato Juice of Powerful Power (tomato + scrumptious reagent), an Ointment of the Occult (grapefruit + scrumptious reagent), and finally an Oil of Expertise (cherry + scrumptious reagent). That should boost your muscle enough to seriously improve your survivability.
Also, if you don't have it yet, the Exotic Parrot from the Black Market will increase your resistences as it increases in weight, and may allow you to survive another round or two.