Another one here saying give it time. It will feel like the end of the world at the moment. Every step you take it feels like everything is going to fall out. But it is very likely to improve with time and appropriate exercise.
For me it was:
4 months pp - 12 months pp - NHS Physio
12 months onwards - private physio and clinical Pilates.
I'm now 2.5yrs pp and I've spent lockdown doing PE with Joe with no discomfort, no leaking etc - albeit without the jumping! But I didn't stop feeling the bulging for over a year.
My life (and prolapse) looks nothing like it did when my baby was two months old. It's a world away now. But it has taken years. it's not "healed", as in it's back to normal, but these days it's fine and very liveable with.
I suggest joining the (private) Facebook group called Association for Pelvic Organ Prolapse Support. It has women from all round the world who have suffered how you are suffering.
I also needed counselling. My prolapse was a direct result of birth injuries that should never have happened, and I was so, so angry for a long time.
Your physio should grade your prolapse and set you up with a proper programme of pelvic floor exercises, as well as exercises that will heal and develop your entire core strength. They should also be able to discuss with you things such as pessaries if one would be useful. If you're not getting helpful info, try and find a new physio.
In terms of machines, both the physio's I've worked with have said not to use them, so I haven't, but I'm aware that other physios make different recommendations. Again, this is something they should be able to talk you through.
I've swapped my exercise around. I don't run or jump, but I do cycle, row, do weights, Pilates, barre and yoga. I've learnt to adapt the bits I need to to protect my pelvic floor. There are definitely ways to get fit other than running - you just need time to find your new niche. I would think that running wouldn't be sensible right now, but in the future with a pessary support - or maybe without! - it's entirely possible.
You're not on your own