I started my periods when I was 10 (lucky me!) 5 years before I was diagnosed, every month I'd have to do have about 3 days off school as my periods were agony and would also cause stomach upset, with hindsight we know now that was probably the Crohn's, I was put on the pill at 12 to help control it and things settled down amazingly. I stopped the pill when I got diagnosed (was just to ill to bother with remembering it) and was then too underweight to get periods for about a year. I then went back on the pill but I hated the withdrawal period as it became painful when I bled and got lovely D, and then I was recommended either the injection or the implant by the family planning nurse was also concerned that I may not be able to absorb the pill properly as apparently with IBD things like the morning after pill doesn't work. I didn't go for the injection due to my arthritis as it can apparently cause bone and joint problems and I didn't like the idea that once its in you its stuck for 3 months so if it didn't agree with me I'd have to wait it out!
I got the implanon implant 2 and half years ago and its been brilliant, apparently when you look at all the different types of birth control and the hormone levels in your body on a graph it would like:
The pill - jaggedy line - hormones fluctuating according to breaks etc
The injection - diagonal line from up to down - hormone levels going from high to way down and then back up again when next jab issued.
The implant - one long straight line - hormone rate very steady
I may not have explained that very well but thats pretty much how the FP lady explained it and apparently its the steadiness of the implant which makes it good as your hormones aren't all over the place so your moods and everything stay steady and the best bit - no periods for the majority! But for me its been brilliant, especially as my stomachs always been very reactive to my mood and as a once bad PMS sufferer I don't think my poor tum would be able to handle PMS emotions!!