Started Getting Spots after Roaccutane (isotretinoin)

Hi, i have had acne for about 3 years, i have used benzoyl peroxide along with 2 or 3 other facial creams with no success. I then went on 3 different antbiotics for about 6 months for each one 18months in total and they didnt help at all. After asking my doctor for over a year I finally got referrd to a dermatologist who put me on accutane staright away, 40mg a day for 4 months. After 2 months on accutane i had no spots at all after finishing the treatment my skin was dry but still no spots. 3-4 months after finishing the treatment, im getting lots of whiteheads again around my mouth whereas before i used to only get them on my cheeks. I would like to go back on Roaccutane as i feel a second course would finish it off for good but it took so long to convince my doctor to reffer me last time im worried he wont and my skin will gradually get worse and worse. what should i do?

p.s Im 20 years old from the UK,

Thanks, Tom