It could be possible that it could be anything else such as: atopic dermatitis, eczema, asteotic eczema, cutaneous candidiasis, contact dermatitis, drug eruptions, Pemphigus, Pityriasis rosea, Roasacea, Tinea, lichen simplex, lupus, xerotic eczema, exfoliative erythroderma, chronic granulomatous disease, vitamin B and/or zinc deficiency, erythrasma, and there can be any more number of possibilities.
I had referred to it as chronic, because you said you have it for over a year now, and sometimes your face feel great (for 2/3 days). Moreover, with a previous history of acne, and with the specific area involved, with you mentioning that the area of involvement is very oily, and your back is covered with in spots, seborrheic dermatitis comes first to the mind. However, clinical correlation is required to reach some conclusion, following which some other confirmatory tests shall be required.
If one has been using a lot of antibiotics and over the counter products, the clinical picture would never remain as per the text books. Your dermatologist has to correlate your history with the examination findings. It would be in your interest to seek your doctor’s opinion before you use some over the counter product or antibiotics.