I don't know if the poison ivy is related to your acne, since it is very common to get acne at the age you did.
Specifically, what did you try for your acne? One of the best topical gels is Differin which is effective at clearing acne whilst being generally well tolerated without causing excessive dryness like other preparations can.
Use a good quality cleanser for combination skin. I like Estee Lauder's Perfectly Clean Splash Away cleanser which gives a real soap-and-water clean feeling without dryness. Apply an astringent toner only to the oily areas and a light moisturiser only to the dry areas.
Does the rash on your forehead itch?