HI Rhian
Problematic bleeding on any conti HRT can be an issue. You are still young and quality of life is very important as well as protecting your heart and bones. If the erratic bleeding was your only side effect with HRT and in other ways the HRT was improving things, then it might well be worth continuing HRT but as I suggested, try the Mirena if you want a non bleed HRT regime or stick to a sequential HRT which gives a predictable monthly bleed - many women stick with a sequi HRT, well into post meno, as it gives fewer problems and side effects.
I had an early menopause and tried being without HRT for 3 years from the age of 49 - I now refer to these years as my lost years as I did feel awful most of the time. When I went back on HRT I tried all types of conti HRTs but got too many side effects but the Mirena with Oestrogel proved a good option at that time. Now 62, I have been without HRT for 2 years due to awful cramps and erratic bleeding with any HRT (my uterus simply didn't want to play ball any longer) and now my low energy, headaches and joint issues have to be managed - I do miss the energy oestrogen gives.
If you can really get your diet in peek condition and do a lot of weight baring exercise, do lots of relaxation techniques and pull back on as much stress as possibly in your life, then you may well be fine for the longer term.
Why not take a break for 3 months, keep a diary and see how you feel about what you want to do? Perhaps ask for a bone scan to see if your density is OK? DG x