Dry skin and differin?

so my acne is between mild and moderate but its only on my cheeks. never any pustules just white heads. i talked to my doctor and he recommended differin gel, i only use it at night. and in the morning i use clindamycin 1% gel. im also taking tetracycline pills but i still have pimples, but the bad part is now im flaking rly bad. it also made my skin very sensitive. its so sensitive even when i chew i can feel my skin being streched when ever i open my mouth. i have been doing this routine for a week now and i heard its supposed to get worst before it gets better, is this true? also i need some advice on what face moisturizers i can use that wont clog pore and will get rid of all the flakes on my face. plz help