2 WEEK PERIODS !!??

So I got the implant in November to be stress free for sex and possibly stop my bad period pains and they said it would take about 3-6 months to calm down and sort out the days of period again but it's been 6 MONTHS NOW and i've bled for about 2 weeks EACH MONTH!! 
I'm also really afraid of needles and this took a lot of guts for me to get and I really don't wanna be getting sliced open to take this thing out and worrying about other contraception !!
any advice ??