Do you think i have a hormone imbalance i've always had acne but it's become worse and now it's on my back face, neck, been to dermatologist b 4..???

Acne treatment : Many people have acne and there are many good treatments for it. Speak to your doc about them.

Just manage it: If your monthly cycle is normal, you will not find a treatable underlying cause for your acne. If I understand your history, you are using doxycycline as sole therapy for acne. You need to add a topical agent such as benzoyl peroxide. You may also benefit from a medicine like spironolactone, and various forms of the oral contraceptive pill can work as well.