It's good that you have just accepted it and carry on with your life

i would like to try and cure mine first before i get to that stage. I believe that everyones injury is slightly different to others and some people a lucky enough to find a way to fix it,
Well, in that case, lets go through each one of your choices:
Supplements --> supplements don't really help heal anything. They may aid in certain processes in the body, but the body heals itself no matter how you hurt yourself. Regardless, I've taken MACA, fenugreek and many more supplements and they seem to help minimally with libido. Cialis and Viagra work the best by far for erection.
Stretching/Yoga/Pilates --> possibility that it can help. Many of tried this and says that it may help, but not proven to consistently help. I tried a lot of stretching, but it didn't work for me
Abstinence --> In my opinion, this is the worst thing you can do for HF. Do not rest for more then a week or else you're just deconditioning your dick. Rest for too long and you'll be orgasming in less then 10 seconds each time you have sex.
Pelvic trigger point therapy --> Seems to have good results. I tried, but it never worked for me
Reverse Kegels --> hypothesized to relax the pelvic floor; definitely helped with my pre-ejactulation that I suffered from resting my dick for 2 months, but didn't make my HF go away.
Water fasting --> Doubt it does anything
It went on its own just left it to do its own thing.
Carried on as normal. --> this is probably your best bet. Carry on life normally and have sex no matter what happens. If your problem does not go away, KEEP HAVING SEX.
Continued with PE e.g. strething/jelqing and it went away. --> have not tried this. Too scared but something tells me it could possibly help but I am not suggesting you try it.
Never been cured. Still have it to this day! --> still have it, like many members here. I'm not sure exactly what causes it because no proven treatment has been deemed effective, but its pretty minor in the grand scheme of things.