Some of those things could be related to endo but it sounds like you need to go to the GP. And you might want to track your symptoms over time. 6 weeks is probably not long enough to work out what's going on after coming off the pill.
If you've had the all clear for STIs, the small bumps you describe could be sebaceous cysts and are unrelated to endo. Sometimes wearing pads or pantyliners constantly can cause them. Have you ruled out thrush?
Are you getting plenty of fibre in your diet? I have endo-related constipation, and I find that Fybogel works (it's basically pure fibre), but there may be other things to try first. Fybogel does initially make the bloating worse before it gets better.
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