It does sound like you might have endometriosis based on the severe pain that you get with every period. The mini-pill has the same hormones in it as the depot, so should help with the pain once you have been on it for a while. It is much easier to stop the mini-pill quickly when you want to get pregnant, unlike the depot.
I think it is very reasonable to see a specialist about your symptoms, especially as they are so severe when you are not on the pill. You can then be advised about what to do when you need to come off the pill completely and prepare for pregnancy. There are also operations available to help endometriosis if it is found to be the problem. Go and talk to the GP about it again and ask for a private referral because you should be covered (you need to check yourself exactly what your personal insurance covers).
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