Has anyone had a severe side effect from using Doxycycline for acne treatment? ?

Im supposed to start my acne treatment tomorrow with 100mg per day of Doxycycline and Clindamycin topical solution. Im kind of afraid of the side effects. Does this treatment clear you up after a few months and then you are done with acne for life, such as with Accutane? I have had moderate to severe acne for 16 years. Im kind of desperate, but don%26#039;t want to do anything life threatening.|||ur gonna die in 7 days